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Does this explain why my '61 5512 sub has a "long 5" and a "kissing 4", a worn printing pad?… in any old official pic or in any old rolex catalog You won't find anything except long5s from early 5512 models till almost all of the 60s, so I've never understood why long5 is called mk2 …
About mk1 inserts consider that features are hardly visible and clear when numbers have grown and blown due to time and use, so I wonder if You can imagine what an mk3 insert could looks like if grown and blown …
Edit for typo
...between the 4 and 0, the one I had went the same colour and I was told it was a fat mark 3 but to me that makes no sense as I took it from a 1966 watch that had not been serviced, I've had watches dated 69 with kissing 40's and they get called mark 1's and early 60's watches with long 5's I would say mark 2's are mark 1's!!worth a lot of money I think.
Sorry, but the names and descriptions are getting a bit out of control lately