Longines 'Sei Tacche' Wristwatch with 24-Hour Dial

Technical characteristics

Type

Military-style wristwatch

Calibre

23M

Lug Width

18mm

Case Design

Sei Tacche screw-back case

Jewel Count

17

Movement Type

Mechanical manual-wind

Place recorded

Switzerland

Maker / attribution

Longines

Design

Visible features

• Cream or light-coloured dial with aged speckling/patina • Blued steel hands with discoloured luminous infill • Inner printed 13–24 hour numeral track • Fluted winding crown at the 3 o'clock position • Outer chapter ring with five-minute Arabic increments and minute tick marks

Visual Dial and Display Features

Direct visual inspection reveals a cream or light-coloured dial displaying aged speckling across its face. The dial layout includes an outer chapter ring marked with minute tick divisions and Arabic numerals at five-minute intervals, a primary hour scale in Arabic numerals, and an inner concentric track featuring 13–24 hour markings. The time is indicated by blued steel hands with discoloured luminous infill alongside a slim central seconds hand. A fluted winding crown is positioned on the case flank at 3 o'clock. In the source text, the vendor describes this arrangement as a "military-style 24-hour dial" and notes "blued steel hands with original lume."

Source Discrepancies and Limitations

There is an unresolved contradiction in the source text regarding the case material. The initial overview bullet points list "Case Chrome Topped", whereas the technical specification table denotes "Case Stainless Steel". Because neither the movement, inner case back, lug stamping, nor the referenced Longines Extract of the Archive are visible in the provided imagery, claims regarding the calibre number, matching lug stamps, and precise dating rely entirely on the seller's listing.

Case Construction and Stated Dimensions

The listing describes the watch as featuring a "Sei Tacche screw-back case," noting that "these case backs were milled with three or six notches designed to aid in tightening the threaded case backs to the case to provide adequate protection from moisture and dust". The listing also claims that the watch has "matching case and lug numbers." Reported dimensions show a discrepancy in width within the source: the overview prose states the watch is "relatively small by today's standards at 32mm", while the technical specification table lists "Width 33mm". The table further records a lug height of "41mm", a lug width of "18mm", and specifies a "Plexiglass" crystal.

Reported Movement and Archival Documentation

The internal mechanism is not visible in the provided image. According to the seller's specifications, the movement is a mechanical manual-wind Longines "Calibre 23M" with "17" jewels and a reported power reserve of "41 Hours". The watch is listed with a "Date of Issue 1945" (or circa 1945). The seller states that they "applied for an Extract of the Archive from Longines which provides documentation of our findings about this watch and will be supplied with the watch upon purchase."

Identification

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.