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Below is a pair of R1618 that I own. One was my late Dad's while the other was mine. Mine would be newer. Unfortunately I can't tell which is which any more. Are there ways to date these?
I would say that the upper wrench in the pic is your father's, because it only has a patent number on it.
Newer wrenches have the WARNINGS on them because of this litigation crazy society we now live in !!
Hope that helps.......