BCSFS

Good evening, I have a customer that has a number of these old hammers. They have the same eye as a regular 6-12lb sledge. They use them for striking tie-plates on the ends of rail ties when the machine doesn't seat them fully. They're almost like a very oversized planishing double-round, but I would very much like to know what these REALLY are. I've never seen that "A\" mark before, but it is on all of the ones that have marks. Most also have "16S" and what looks like either "10Q" "1OQ" or "1QQ" depending on which one you look at. They are located in central Texas. Thank you for your time!