2012–present · 42mm · caliber Urban Jurgensen Cal. 9: manual-wind with tourbillon, 21,600bph; flying tourbillon at 6 o'clock; movement hand-finished to the same standard as Cal. 11; one of the rarest independent tourbillons produced today
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Movement tier: unclassified · caliber Urban Jurgensen Cal. 9: manual-wind with tourbillon, 21,600bph; flying tourbillon at 6 o'clock; movement hand-finished to the same standard as Cal. 11; one of the rarest independent tourbillons produced today
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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The Urban Jurgensen 2340 Tourbillon is one of the rarest independent tourbillons produced today. Authentication requires examination of the flying tourbillon at 6 o'clock, provenance documentation, and ideally inspection by a specialist with direct UJ tourbillon experience.
Known issues in the market
Production is extremely small; any example should have clear and documented ownership history.
The flying tourbillon cage should complete one revolution per minute; this is observable and should be checked.
Provenance documentation from Urban Jurgensen is available for legitimate examples; a boutique can confirm a serial number.
Area
What to check
What is correct
Red flag
movement
Flying tourbillon rotation at 6 o'clock
Tourbillon cage completes exactly one revolution per minute; the motion is smooth and consistent; the bridge holding the cage is a single cantilever (flying design, no upper jewel)
Tourbillon stopped or irregular; visible upper jewel or bridge above the cage (non-flying design); rotation rate other than one per minute
movement
Hand-finishing matching Cal. 9 specification
Same anglage, perlage, and straight-grained finishing as other UJ calibers; the tourbillon cage itself should be chamfered and polished
Machine-regular finishing on the cage or bridges; unfinished edges anywhere in the visible movement
dial
Dial construction and tourbillon aperture
Tourbillon aperture is positioned at 6 o'clock with clean, polished edges; dial text and numeral quality consistent with UJ standards
Aperture edges that are rough or irregular; dial text quality below the standard of other UJ dials
case
Case metal and hallmarks
Platinum or gold with correct purity marks; 42mm case diameter; appropriately heavy for declared metal
Missing hallmarks; weight inconsistent with declared metal
Common legitimate replacements
No standard replacement parts exist for the 2340 Tourbillon; any modification should be documented.
Expert resources: Urban Jurgensen boutiques can verify via serial number for this reference. Auction house specialists with tourbillon watch experience are strongly advisable for any purchase. Budget for a specialist inspection before any acquisition of this value.
Authentication guide
Last reviewed June 2026
The Urban Jürgensen 2340 Tourbillon is the complication centerpiece of the line. The tourbillon carriage, movement finishing, and provenance documentation are the primary authentication anchors.
Known reproduction risks
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LOW
No known reproduction at this production level
Generic tourbillon carriage design differs from UJ's proprietary cage
Finishing below the UJ standard
For the 2340, provenance documentation through Urban Jürgensen and major auction records is the definitive path alongside physical inspection.
Dial variants by era
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Era
Description
Identifiers
2340 Tourbillon production
Tourbillon visible through dial aperture. Dial layout designed around the tourbillon carriage at the typical 6 o'clock position.
Tourbillon carriage at 6 o'clock, rotating once per minute
UJ movement architecture visible through the caseback or dial aperture
Precious metal case markings
Service part flags
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Tourbillon carriage
Original: UJ tourbillon carriage; the architecture and finish are consistent with the brand's hand-finishing standard.
Replacement tells
Carriage rotation rate other than one revolution per minute
Cage design inconsistent with UJ reference images
Any machine-finished bridges or rounded anglage on the cage
Movement finishing
Original: Same hand-finishing standard as all UJ calibers.
Replacement tells
Rounded anglage anywhere on the movement
Hazy or matte surfaces on bridges that should be mirror-polished
Case back markings
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All 2340 production
Urban Jürgensen markings
Tourbillon caliber designation
Serial number
Precious metal purity marking
Movement tells
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Tourbillon carriage should rotate once per minute; confirm over 60 seconds of observation.
Movement is manual-wind; no rotor present or audible.
Full UJ hand-finishing standard applies to every visible surface.
