Wristwatch · Sei-Tacche military-style watch

Longines Sei-Tacche Reference 23788

Partially verified

This Longines Sei-Tacche wristwatch, reference 23788, is a vintage military-style timepiece housed in a 33 mm stainless steel case. The model designation Sei-Tacche, meaning six notches, refers to the unique case back construction designed for an enhanced seal, which required a specialized tool for removal. The watch features a beige dial that has developed an aged patina, complete with black Arabic numerals filled with radium luminous material and a secondary red 24-hour scale. The time is indicated by blue steel hands. The case is described as being in excellent condition with long lugs and visible factory engravings on the case back, complemented by a matching engraving on the top left lug. The watch is currently fitted with a two-piece black canvas strap. The source records indicate conflicting production dates, citing 1948 in the title and 1951 in the descriptive text.

Longines Sei-Tacche reference 23788, featuring a 33mm steel case and a patinated dial with 24-hour scale. — Craft & Tailored. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: zamanito.com
Category: Wristwatch · Sei-Tacche military-style watch
Maker / attribution: Longines
Reference: 23788
Catalogue / lot identifier: LGSST23788
Source-reported date: Circa 1948 or 1951
Source-reported place: Not established
Source-reported serial: 83XXXXX

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Construction

The timepiece features a 33 mm stainless steel case characterized by its Sei-Tacche construction. This specific configuration features six distinct notches on the case back, a structural design element intended to provide a more secure seal against the elements. The case retains its original long lugs, which remain symmetrical despite minor surface wear and signs of prior polishing.

The dial displays a warm beige hue consistent with age-related oxidation. It is populated with black Arabic numerals coated in radium luminous compound. Complementing the primary hour markers is a secondary red 24-hour scale, while the time is read through blued steel hands. Small, localized discolourations are present across the surface, confirming the aged status of the dial.

Evidence for this section

“نام این دو به‌ترتیب از شش و سه شیار پشت قاب گرفته شده است؛ ساختاری برای آب‌بندی محکم‌تر که بازکردن آن ابزار مخصوص می‌خواست.”
“این رفرنس 23788 دارای قاب استیل 33 mm، صفحه نظامی با رنگ بژ گرم ناشی از کهنگی، اعداد عربی رادیومی، مقیاس قرمز ۲۴ساعته و عقربه‌های فولادی آبی است.”

Signatures and Identifiers

Authenticity markers for the reference 23788 include specific factory engravings located on the case back. These markings remain distinct, testifying to the technical specification of the model. Furthermore, a corresponding engraving is found on the reverse side of the top-left lug.

While identifying the specific production year remains subject to discrepancy within the documentation—citing both 1948 and 1951—the serial number 83XXXXX serves as the primary unique identifier for this particular movement/case unit.

Evidence for this section

“پشت قاب شش‌شیاره با سایش اندک و حکاکی‌های کارخانه‌ای واضح همراه است؛ حکاکی متناظر پشت شاخک بالای چپ نیز در منبع مؤید اصالت دانسته شده است.”
“منبع احتمال می‌دهد تاج متعلق به خود ساعت باشد”

Condition and Attribution

According to the provided auction reporting, the case is in excellent condition, having preserved its original proportions. Although the surface exhibits light scratching and evidence of previous maintenance polishing, the geometry of the lugs remains intact. The watch is sold paired with a two-piece black canvas strap.

The reported status is based on documentation provided by the seller. These details regarding the watch’s condition and provenance are not independently verified and are attributed strictly to the auction house's records.

Evidence for this section

“قاب در ارزیابی منبع وضعیت عالی دارد و شاخک‌های بلند آن ابعاد کامل و متقارن خود را حفظ کرده‌اند”
“این اطلاعات و سابقه به منبع نسبت داده می‌شوند و تأیید مستقل اصالت یا کارکرد توسط زمانیتو نیستند.”

Open research questions

Can archival records from Longines reconcile the conflicting 1948 and 1951 dates?
Does the serial number 83XXXXX definitively correspond to a specific production batch for reference 23788?

Source evidence

Recorded claims and source quotations for Longines Sei-Tacche Reference 23788
Field	Source-reported value	Source quotation
Maker	Longines	“برند: Longines”
Reference	23788	“رفرنس: 23788”
Case Diameter	33 mm	“قاب استیل 33 mm”
Serial Number	83XXXXX	“شماره سریال: 83XXXXX”
Case Construction	Six-notched back	“نام این دو به‌ترتیب از شش و سه شیار پشت قاب گرفته شده است؛ ساختاری برای آب‌بندی محکم‌تر”
Dial Features	Arabic numerals with radium and red 24-hour scale	“اعداد عربی رادیومی، مقیاس قرمز ۲۴ساعته”
Strap	Two-piece black canvas	“ساعت با بند برزنتی مشکی دوتکه عرضه می‌شود”
Date Conflict	1948 or 1951	“تاریخ این نمونه در عنوان ۱۹۴۸ و در متن ۱۹۵۱ آمده است.”

Visible details

Six-notched 'Sei-Tacche' case back design
Blued steel hands
Red 24-hour inner track scale
Aged beige dial with radium luminous numerals

Research qualifications

Conflicting production dates of 1948 and 1951 provided by source
Attribution of the crown as original is only a possibility suggested by the source
Authenticity claims are based on the auction description rather than independent verification

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت مچی Longines Sei-Tacche رفرنس 23788 با صفحه نظامی تروپیکال

Reviewed 2026-11-02 · Record 674b0f9409

Terms in this record

Glossary explanations for terms named in this object’s record.