I realize this is a very old post, but people still stumble across it.. I want to point out there is one quick and easy key spotting feature (among other differences) between M48A5 and the "straight" M60 from the 1959-61 production run. They share the same style 105mm gun tube with mid-span bore evacuator and have very similar bubble turrets. The pictures show the nose of the hull to be square-angled. It is not rounded like on M48's. Plus it has the big "eyebrow" headlight guards (okay, I added another quick spotting feature). Another spotting feature is the M48-series has 5 idler wheels supporting the upper track, although I have seen a later mod where two of them are cut off, which mimics the M60-series. There are a few other slight external differences on the cupola and turret but no need to get into that here since the squared nose and bubble (rounded) turret are clear in the pics.
The tank pictured here with its M48-style bubble turret is a straight M60. It is not an A1, not an A2, not an A3).
Take it from a long-time Armor BN vet. We were trained and tested in spotting features between the M48A3, A5, M60, M60A1, A2 and A3, as well as soviet-bloc armor and vehicles of that time. I was around all of these variations of the "Patton" back in the era when you could watch or participate in dragging the occasional M103 heavy tank and M59 apc's downrange for targets. By the 1980's the M88's were dragging long strings of M114's downrange. Many of us were angered that none of the 114's were going to the DRMO, so we at least wanted the engines from them. But nope. Boom! Didn't take long for them to look like torn and shattered beer cans full of holes. The M103's obviously held up much better and for longer, but were not immune to 105 rounds