Didn't realised you owned a 2852!
The only differences I can see is that the 2852 case doesn't have the rivets or facets (don't know terminology..) on the side of the lugs, the 2852 has just sharp slightly more angular lugs, and also not sure if the lack "officially certified" on Mikes makes it the later one.. It's just as beautiful IMO, I'm glad they didn't change it too much into the 60's.
Edit: I'm astonished at how sharp Mikes actually is, looks like it's not been touched!
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