Name: Panerai Radiomir Quaranta 40mm PAM01386
Brand: Panerai
SKU: PAM01386

The Radiomir Quaranta is Panerai's answer to the obvious question: what if someone actually wants to wear one of these? At 40mm, it sits where most watches live, and the wire lugs and clean dial give it the Radiomir DNA without the wrist presence of a small dinner plate. This is the reference to buy if you love the aesthetic but kept walking past Panerai counters because nothing fit.

What it is

The Radiomir line traces back to Panerai's pre-Richemont military commissions, when Italian frogmen needed legible, robust dive instruments. Those originals ran 47mm because they were strapped over a wetsuit. The Quaranta , quaranta being Italian for forty , arrived in 2021 as an explicit concession that civilian wrists are not wetsuit-wrapped.

It uses the P.4000 automatic caliber, developed in-house, with a slim profile that keeps the case from ballooning. Wire lugs, no crown protector, sandwich dial: all the correct details, in a size that most people can actually wear.

Buying notes

Verify the dial is a genuine sandwich construction with the correct depth and luminous material treatment , early examples have shown some variation in lume application uniformity that affects long-term legibility. The P.4000 is relatively new, so extended service history is limited; inspect the crown seal and case back gasket carefully on any used example, particularly one sold as "unworn" years after production. Wire lugs are correct on the Quaranta but are also a wear point: check that both lugs sit flush and show no stress marks, since the design is less forgiving than a fixed-lug case if the watch has been dropped.

The market has some gray-channel stock, which is fine, but confirm you are getting a full set with papers dated to purchase, not a retail-fresh watch that has actually sat in a drawer for two years.

Market read

The Quaranta trades at or near retail on the secondary market, which is a signal that Panerai priced it correctly and demand is real rather than speculative. It has not attracted the premium flipping that larger Panerais sometimes see. As the entry point for wearable Panerai, it holds value steadily without dramatic swings.

Service expectations

The P.4000 automatic is an in-house Panerai caliber with a 3-day power reserve and a relatively simple layout that keeps service costs reasonable. Panerai boutiques and authorized service centers are the right call for case re-sealing and gasket replacement, which should be addressed every five to seven years given the steel case and water resistance rating. Independent watchmakers comfortable with modern in-house movements can handle regulation and crown service outside of full overhauls.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Mass-produced#1 in familyOfficial press photos

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Movement tier: unclassified · caliber Panerai Cal. P.4000: in-house automatic, 28,800bph, 72h PR; used in Radiomir Quaranta P01386; Panerai modern slim automatic for Radiomir family · 72h power reserve (3 days)

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

Wire lug attachment and 40mm case size are the two primary authentication checks; Cal. P.4000 is automatic.

Known issues in the market

The 40mm case is substantially smaller than typical Panerai; misrepresentation of case size is common.
Wire lug attachment same as Radiomir 1940; spring-bar modification destroys originality.

Area	What to check	What is correct	Red flag
case	Wire lug attachment and case size	Wire bail lugs; 40mm case diameter; cushion case profile per PAM01386 specification	Spring-bar holes; case measuring more than 40mm; non-cushion case shape
caseback	P.4000 caliber	Cal. P.4000 designation; automatic rotor; 72h power reserve	Manual-wind movement; incorrect caliber; non-Panerai movement
dial	Radiomir Quaranta text	Radiomir Quaranta designation correct; sandwich dial construction	Incorrect model text; non-sandwich dial; luminous material applied on dial surface

Common legitimate replacements

Original Panerai strap on wire bails; generic straps compatible but wire attachment must be preserved.

Expert resources: Panerai Radiomir Quaranta PAM01386 press materials. Panerai Cal. P.4000 documentation.

Authentication guide

Last reviewed June 2026

The Radiomir Quaranta (PAM01386) is Panerai's 40mm Radiomir, with "Quaranta" meaning forty in Italian. It uses wire lugs, no crown-protecting device, and the in-house P.4000 automatic caliber in an 11.3mm case height. The slim proportions and wire lugs are the defining physical tells against all standard Luminor references.

Known reproduction risks

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MEDIUM

Replicas typically use thicker cases that do not match the 11.3mm height specification, solid drilled lugs rather than wire, and outsourced calibers that are thicker than P.4000.

Case height that appears comparable to a standard 44mm Luminor rather than the slim 11.3mm Quaranta profile
Solid drilled-through lugs on a stated Quaranta
Crown-protecting lever present on a stated Radiomir
Movement visible through any caseback that shows caliber geometry inconsistent with P.4000

The 40mm size and wire-lug combination is specific enough that the Quaranta attracts less replica volume than the larger Luminor variants. However, any secondary market example should be measured for case height and lug type before purchase.

LOW

Earlier Radiomir references or standard Radiomir cases without wire lugs presented as the Quaranta reissue.

Lugs that are solid and drilled through on a stated Quaranta
Case diameter larger than 40mm
PAM reference number on the caseback inconsistent with PAM01386

Dial variants by era

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Era	Description	Identifiers
PAM01386 current production (2021 to present)	Sandwich dial in silver or black, 40mm case with wire lugs, traditional screw-down crown without bridge, power reserve display, slim 11.3mm height.	No crown-protecting lever: this is a Radiomir; the traditional crown without a bridge is the defining visual identifier Wire lugs at the case corners: thin wire loops rather than solid machined lugs Case diameter 40mm, substantially smaller than the standard 44mm Luminor family Case height 11.3mm: slim profile more aligned with dress watch proportions Sandwich dial with aperture-cut numerals and indices "RADIOMIR" and "PANERAI" text in the correct typeface "P.4000" caliber designation on the dial for this reference Power reserve indicator on the dial

Service part flags

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Wire lugs

Original: The 40mm Quaranta case uses wire lugs, the same historical specification as the Radiomir 1940. The wire should be of consistent gauge, secured flush at the case junction, and finished to match the case metal. On the smaller 40mm case, the wire lugs are proportionally more delicate than on the 47mm 1940.

Replacement tells

Solid drilled-through lugs on a stated Quaranta -- wire lugs are the design specification
Wire with visible gap at the solder or attachment point on the case body
Wire gauge that appears too thick or too thin relative to the 40mm case proportions

Crown (no bridge)

Original: Traditional screw-down crown without lever or bridge. The absence of the bridge is the defining Radiomir architectural distinction. The crown on the Quaranta is proportional to the smaller 40mm case.

Replacement tells

Crown-protecting lever present on a stated Radiomir Quaranta -- this architectural element belongs to Luminor, not Radiomir
Crown diameter inconsistent with the 40mm case proportions (a Luminor crown on a Radiomir case is an immediate tell)
Crown without screw-down function: the Quaranta seals with the crown, not a lever

P.4000 caliber

Original: Cal. P.4000 is Panerai's in-house automatic for the Radiomir family. It beats at 28,800bph with a 72-hour power reserve and a slim 4.2mm height to fit the thinner Radiomir cases. The movement is signed and finished to Panerai manufacture standards.

Replacement tells

Movement height inconsistent with the 11.3mm total case: a thicker caliber would produce a visible crown on the caseback or an incorrect case curvature
Movement without Panerai signing or with generic caliber bridge geometry
Caliber designation on dial reading something other than P.4000 for this reference

Case back markings

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PAM01386 current production

Solid caseback with engraved "PANERAI" text and reference PAM01386
"RADIOMIR" on the caseback
Serial number on the case band
"SWISS MADE" on the caseback
Water resistance rating: 10 ATM / 100M
Caseback profile noticeably slimmer than any 44mm Luminor caseback

Movement tells

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Cal. P.4000 beats at 28,800bph with a 72-hour power reserve. A fully wound PAM01386 that stops in under 65 hours warrants inspection.
The slim 4.2mm caliber height is the design constraint that keeps the total case at 11.3mm. Any movement thicker than this specification would physically alter the case profile.
The power reserve indicator should advance smoothly and reset correctly. Erratic indicator behavior indicates a worn indicator lever or mainspring.
The Quaranta's automatic rotor winds in both directions. Any ratcheting sound from the rotor indicates a worn automatic mechanism.

Sources: Panerai -- Radiomir Quaranta PAM01386 and Cal. P.4000 specification; WatchUSeek -- Panerai Radiomir authentication forum; PaneraiCentral -- Radiomir family wire lug identification guide.