Like many of the older movements, the Marvin 700 was subjected to different bridge layouts. The remaining stock were bought up in the eighties by Chronoswiss and now make up their Cal. 111 range. The Chronoswiss version has more curved bridges.
Thank you for your comment,only what is strange for me is that Marvin made 700 with 17 jewels and 5adjs,but this one have 15 jewels and 3adjs,is it possible that this is the firs Marvin cal 700 ever made?
Dunno about "first one ever made" (unlikely, but maybe the first series ever made of that movement). However, different jewel counts in a movement line were by no means unusual and even the modern ETA movements come in four grades with three different adjustments ("Standard": 1 adjustment; "Elabore: 3 adjustments; "Top": 5 adjustments; "Chronometre": 5 adjustments plus COSC certificate).
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