Not sure where you got the idea that there were problems with the bumper movements. They are very robust. I have several of them and never a problem getting them serviced,or finding parts if needed.
Cals. 501/505 are also pretty good. Parts are out there except for the chronometer engraved rotors, which are quite rare. The issues with the 2852's mostly have to do with the dials, which had problems with bad lacquer. Most were refinished years ago and very few were done accurately.
Hope this helps,
gatorcpa
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