I just purchased a Columbia (N.Y. Standard) that is in a case with just an arm and hammer in a four sided diamond trademark and a serial number. I know both Philidelphia and later Keystone used that trade mark. From what I have sound some are gold filled and some are brass. Is there any way to tell which is which like perhaps the gold filled would have a warranted for x number of years? Also any way to tell which of the companies may have made it?
Thanks,
Thanks,