Anyone ever seen pushers with punched(?) code?

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Top pusher looks like it has the code K.18. A part number perhaps?


Can't tell if the bottom pusher has the same
 
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Well, given the fact that it’s a horrible re dial, I guess I can’t attach any more significance to that pusher. Seems odd to me that such a mark would be so visible on a gold chrono. Perhaps someone had an inventory of factory prototype parts? A lot of that stock ended up in Italy I hear.