I was given some older ridgid dies by a friend. They are unused in the package and they are the older double notch that are reversible. some are marked npsm on the packages and some are not marked at all it just says size of die. I have some off the newer ones that are single notched and they are stamped on the end if they are npt or npsm. Is there any way to identifie,these some dont have packages and are marked with size only. Thanks
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