are you sure that is not the patent number?
Parker introduced rebounding locks in the 1872 catalog
the one I just measured is number 50732 - absolutely rebounding
and only 5k before hammerlesss Parkers
ps
just pulled out lifter number 14418 (made 1879) - also rebounding
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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