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Mass-produced#1 in familyOfficial press photos

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Service

Recommended interval
every 5 years
Typical cost (USD)
$300 – $550
Parts availability
excellent

A direct ETA 2824-2 equivalent produced after ETA restricted OEM supply. Parts are interchangeable in many areas, and service costs mirror the 2824.

Also uses Sellita SW200-1

Sinn 556 I Ref. 556.010, black dial, steel case
Sinn
556
Sinn U1 Ref. 1010.010, black dial, steel case
Sinn
U
Anonimo
Militare
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
42 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

The integral crown guard is part of the Nautilo case architecture; any Nautilo where the crown guard appears as an add-on rather than integral has a non-genuine or modified case.

Known issues in the market
  • The Sellita SW200 movement plate is signed and visible; any Nautilo with a non-Sellita movement has had a non-genuine service replacement.
AreaWhat to checkWhat is correctRed flag
caseIntegral crown guardCrown guard is integral to the Nautilo case; flows from the case architectureCrown guard appears as an add-on piece; non-genuine or modified case
movementSellita SW200-1 signed movement plateSellita SW200-1 with Anonimo-signed movement plate visible through casebackNon-Sellita movement architecture or unsigned movement plate
dialAnonimo Nautilo dial textAnonimo brand name and Nautilo designation on dialMissing or incorrect reference text; non-genuine dial
Common legitimate replacements
  • Crystal; sapphire standard.
  • Crown; Anonimo-signed OEM.
Expert resources: Anonimo authorized dealers; Italian micro-brand specialist authenticators.

Authentication guide

Last reviewed June 2026

The Nautilo is Anonimo's dive watch with a distinctive porthole-style crown guard integrated into the case. The cushion-form case and the crown protector are the fastest visual authentication anchors. Movement is Sellita SW200-1.

Known reproduction risks

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LOW

Low reproduction risk at current market prices.

  • Crown guard profile inconsistent with porthole design
  • Dial printing quality inconsistent with Anonimo standard, especially the fleur-de-lis

Dial variants by era

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EraDescriptionIdentifiers
2014 to presentBlack or blue dial with mixed numerals and indices. Date at 3. Unidirectional rotating bezel. Porthole-style crown protector at 3. Cushion case at 42mm.
  • "ANONIMO" at 12, Florence fleur-de-lis logo
  • Porthole crown guard surrounding the crown at 3
  • Cushion case shape rather than round
  • Unidirectional bezel with 60-minute scale
  • Date at 3 with no cyclops on sapphire crystal

Service part flags

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Crown guard / porthole protector

Original: Integrated into the case at 3, the crown protector is a signature Anonimo design element. It surrounds the crown with a circular or porthole shape machined from the case material.

Replacement tells
  • Crown guard showing a different profile from the porthole design
  • Crown guard attachment that feels loose relative to the case
  • Mismatched finish between crown guard and case (brushed vs. polished inconsistency)

Case back markings

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2014 to present
  • Reference AM-1002.01.001.A11 or variant
  • "ANONIMO" and Italian-brand identification
  • Sellita SW200-1 caliber designation
  • 200M water resistance
  • Serial number

Movement tells

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  • SW200-1 power reserve is 38 hours. Below 32 hours from full wind needs service.
  • Unidirectional bezel should click positively with no backplay.
Sources: Anonimo official product documentation, Nautilo family.

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Buying guidance

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