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Wondering if I found a rare iteration of the Venus 170?

Max50916
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Max50916 Watch Enthusiast

Max50916

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Hello, I was servicing this old chronograph that looks to me like it's probably from the mid-late 1930s. I've serviced a few Venus 170 movements before but noticed something different that I've never seen before. It is double stamped "170" for the caliber and appeared to have not been serviced in an extremely long time.

The pivoted detent (I think that's what you would call this part) is unique to anything I've seen. I can't find another Venus movement with this part and can't find any other 170s with this layout either. It does not look custom made and works perfectly fine. 

I'm wondering if this is an odd variant of the movement and if anyone has seen this before?

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