Some things are very similar to a 1911, and some are more like a Browning Hi-Power (it does look like it was made on a 1911 frame though - notice the plate covering the hole where the safety would be on a 1911). Internally, it looks more like a 1911 to me though - other than the safeties (no grip safety, and all the slide mounted safety does is block the firing pin - it doesn't do anything to stop the hammer from falling. It also will not fire without a magazine.)
The magazine (which is roughly the same size as a 1911 mag) only holds 5 rounds, due to it being a rimmed cartridge, and probably because the follower is freaking huge (it's at least an inch tall), lol. I've read that you can modify the magazine so that it will hold 6 or 7 rounds, but I won't be doing that. For a target gun, you would probably normally only be shooting 5 rounds at a time anyway - so modifying it to squeeze one or two rounds in seems kind of pointless to me. You can, surprisingly, still get new mags for it (I guess because even today it's still a sought after target gun), so I'll probably pick up a few spares, just in case.
Thanks for the link. I knew the -1 stopped production in 1970, but couldn't really find anything on dating them by the serial number, other than that the first 52 (no dash) was S/N: 50000, and the -2's had three letters and four numbers.
If they're saying that S/N: 59493 was the last -1 (not sure if that
is what they are saying, or if that's just the serial number of the gun
in that picture...) then this one would have been pretty close to the end.