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It is with regret that I am unable to provide a solution to your problem as this is a specialised subject for which we have no expertise. I therefore can only suggest you contact the manufacturer and/or suppliers for further instructions.

Lot 35 and lot 23 are two-register Carreras from this same period link both with 30-minute recorders. Lot 35 has the SN color scheme a silver-white dial with black registers. Lot 23 shows a unique style for the Carreras with elements designed for pilots Arabic numerals painted in lume and bright white hands with luminous inserts. link This model was produced by Heuer for Lucht Macht Forces Aeriennes the Belgian Air Force with military issuance marks on the case-back link dating the watch to 1970.