As I've said many times previously, what people here refer to as the reference or case number, is in reality only a partial case number, so the confusion continues. The numeric portion of the case number only tells you the style of the case, not the material. The material is determined by the letter prefix to the case number (bolded for clarity). The 145034 (1450034 with current numbering) comes in three different materials as shown below.
055BA1450034 | CASE 18CT.2N YEL.GOLD CAL.0861
055MD1450034 | YEL. PLAT. CASE CAL. 861
055ST1450034 | STEEL CASE CAL.0861
Clearly the case back shown, being made of stainless steel, is not for the solid gold watch...
Cheers, Al
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