Whole bunch of Cold War tanks from countries other than the big tank exporters of the era (US, UK, France, Germany, USSR)
If you squint, the PRC's Type 63 almost looks like an amphibious T-54/55 (20 tonne range)
The predecessor light tank which clearly shows its lineage from the T-54/55/Type-59 (21 tonne range)
Another T-55 derivative, the Type 69 is most infamous for its role as 'target' in Desert Storm (37 tonne range)
Size difference with the Abrams:
Type 80/88 - the last Chinese tanks with the old dome turrets before the change to boxy welded turrets - which actually show up in the later variants of the Type 80 family (40 tonne range)
Q: What do you get if you yank the turret of an M18 Hellcat and slap it on the hull of an M42 Duster?
A: The RoC's Type 64 hybrid
Swiss Pz 58 medium tank (35 tonne range, evolved into the Pz61):
Swiss Pz 61 medium tank (39 tonne range):
Swiss Pz 68 medium tank (40 tonne range):
Japanese Type 61 'MBT' (35 tonne range - medium tank/MBT is a nebulous differentiation, isn't it?):
Japanese Type 74 MBT (38 tonne range)
The Austrian SK-105 light tank saw a degree of export success to Latin America and North Africa. The turret shows its relation to the AMX-13 (18 tonne range)
Another hybrid tank, Argentina ordered new hulls from Austria and mated them with surplus AMX-13 turrets. 39 planned, but only 4 conversions were made
Back to Sweden, the Ikv 91 is classified as a tank destroyer, but I don't see how it's anything but a light tank (16 tonne range)
Another super-weird Swedish tank, the Strv 74 mated a new turret and wider tracks with the hull and powertrain of the WW2-vintage Stridsvagn m/42(26 tonne range)
Speaking of the Stridsvagn m/42, it may be a 1943 design, but it looks closer to pre-war tanks like the LT vz. 38/Panzer 38(t) than anything designed during the war. (23 tonne range)
A bit of an interesting case, Romania went with a modernized T-55 derivative instead of the T-62 or T-72 (photo is of a modernized vehicle, couldn't find one of the tank in its Cold War service guise)