Here's a historical type question that puzzles me. I have a 1966 or 67 GMT 1675 and the movement calibre is a 1570.
I followed this link:
http://www.gmtmasterhistory.com/gmt-..._ref_1675.html
and it tells me that the only two calibre's offered for the 1675 are 1565 & 1575 so where does mine fall in line. Is this information 100% accurate or do I have the worlds rarest GMT?