Colt M1917 .45ACP; CZ52
Sure, everybody should have a couple of beaters.
I have a couple of Colt M1917s, one in .45ACP, the other in 45LC, which can sure hit... even if they're old and ugly. They're not pretty enough to be collector guns so beaters they are. I think most military surplus handguns could qualify as long as they're not in the same category as, say, an SS-marked Luger with matching numbers and holster.
I'll go along with the concept of not "beating" your beaters. All mine are shooters, but the milsurp ones get treated like good tools instead of junk OR treasure. They're respected but not babied.
Same with CZ52. While I wouldn't trust one with my life like I would the old .45s, they're cheap enough to put into a tackle box and certainly durable.
Of course, there's the .22 autos, Rugers for the most part, but they have target sights and inspite of decades of hard use, still don't get handled like beaters just because of their sights, but if I had one with fixed sights, it'd be a tackle box gun, too.