Omega Decimal-Second Split-Seconds Chronograph Observatory Chronometer
Record status
Individual type · partial
Period
circa 1956
Maker / issuer
OmegaThis steel split-seconds chronograph pocket chronometer, reference CK1155, was manufactured by Omega circa 1956. Measuring 65 mm in diameter, the steel case features a screw back and soft iron protective cap, housing calibre 205 with a 2/3 plate movement, lever escapement, and Glucydur screw balance.
Auction documentation states that the watch was entered into the 1956 Neuchâtel observatory chronometer testing in the pocket chronometer category, placing 111th among 213 entries. The black dial presents central chronograph timing hands, a 30-minute register, continuous seconds, and the bold yellow designation 307.
Evidence at a glance
- Linked sources
- 1
- Photograph views
- 1
- Catalogue references
- 0
Counts describe this entry’s documentation, not authenticity, rarity or completeness. Photographs may show one specimen; check each caption and licence.
Technical characteristics
- Type
- Split-seconds chronograph pocket chronometer
- Origin
- Switzerland
- Calibre
- 205
- Reference
- CK1155
- Dimensions
- 65 mm
- Place recorded
- Switzerland
- Movement Number
- 13648828
- Case Description
- Steel, screw back, soft iron protective cap
- Maker / attribution
- Omega
Design
- Visible features
- • Black dial displaying red Omega text and insignia, with yellow numeral 307 inscribed above 6 o'clock • Outer decimal calibrated chapter ring graduated from 1 to 60 along a lighter outer flange • Chronograph pushers flanking the central winding crown and suspension bow at the 12 o'clock position • Two central split-seconds hands terminating in contrasting red and orange painted tips
- Dial and Mechanism
- The watch is powered by a calibre 205 movement, which incorporates a 2/3 plate architecture, a lever escapement, and a Glucydur screw balance. The movement condition is noted as 'very good, capable of running', with a recommendation for cleaning. The black dial includes a 30-minute counter and the numeral '307'. It is fitted with two central split-seconds hands, described as having contrasting red and orange tips.
- Construction and Case Features
- The pocket chronometer measures 65 mm in diameter and features a steel case with a screw back and a soft iron protective cap. The winding crown and suspension bow are located at the 12 o'clock position, with chronograph pushers positioned on the flanks of the case. The auction catalogue describes the condition of the case as 'very good, worn'.
- Object Identity and Provenance
- This split-seconds chronograph pocket chronometer is identified by reference CK1155 and movement number 13648828, manufactured circa 1956. The watch is documented as having participated in the 1956 Neuchâtel observatory chronometer testing within the 'Chronomètres de Poche' category, where it achieved 8.9 points and was ranked 111th out of 213 entries. The object is accompanied by an extract from the chronometer archives by Andreas Hidding. The provided source text mentions the inclusion of an original red bakelite transportation bag, though this item is not present in the provided visual records.
Identification
- Reference
- CK1155
- Serial number
- 13648828
- Source note
- Facts transcribed from the linked source listing or collection record. Attribution and specifications are source-reported and have not been independently authenticated.
Catalogue references
No catalogue numbers recorded. Numbers are only published once transcribed from a verified edition of a standard catalogue — they are never inferred.
Research required
- Research required: Movement and interior casing details are not visible in the provided image.
- Research required: The referenced red bakelite transportation container and archive extract are not depicted.