Here are the 99s my son and I use.
Top is my 1953, 99R 250-3000, Serial #688xxx
Bottom is my sons EG 300. I can't make out the boss code, possibly a D, but the serial # is a 604xxx
Both are factory drilled for mounts and have seen much carrying. We know some of the history of the 250. It came out of Wyoming and was used to feed my S-I-L family when she was real young, deer, elk and antelope. They bought it used and say it has quite a few elk to it's credit, Pete usually would sneak up close and neck shoot them. The old K-4 that was on it is in need of refurbishing so it is holding up an old 2-7 for now.