Lip calendar (or LIP Dato) from the famous French manufacturer. Very nice lugs Original white dial showing some signs of wear signed LIP DATO Arabic numerals, golden hands & embossed markers Date display at six o'clock (black/red even/odd calendar) Diameter: 33 mm (35 mm with crown included) Thickness: 10 mm Signed & numbered stainless steel back (no. 161740) with the Besançon logo (where LIP was based) Vintage brown leather (lizard?) strap (+/-23 cm watch included) The watch is in good condition for its age (signs of wear visible on the photos) Its history of maintenance is unknown but the watch is in good working order. It will be carefully packaged and shipped with tracking *The R23 was designed in 1955 to replace the R25. The 2 calibres were used together for a few years. It was very successful and was only gradually replaced by the R136 in 1963. It has 17 jewels, a second direct central (unlike the R25) and can have a date function (Dato version). Its technology would be improved eight times, and during its tenure each upgrade was marked with the letters A through H, which were engraved on the platinum located next to the reference number for the calibre.