M-51. Sorry, it's kinda hard to keep everything straight when you're thinking about so many things at once. The M-50 is a related version, but all of those are M-51s.

Yes I did make a few corrections and additions after you started on it, mostly because Mike pointed out I made a mistake with a couple of the A2/A3s. I'll check everything again later to make sure nothing got missed.

I'm just glad it's done now though. Reorganizing the Shermans was probably the biggest task out of all the tanks. Now that there's no longer any glaringly obvious errors, I'll try asking a few people I know if they can further ID some of them. Like specifically, to see if there are any Grizzly's in among the normal M4A1s. The Grizzly was the Canadian-produced version. I don't know what to look for on those specifically, but else someone might.