I have remnants of a very early 10mm saw in my 1128 junk box. Quite literally, everything is slightly thinner, lighter, etc. The recoil is thinner casting and is held on with 4mm fasteners. Crankcase is thinner material and the jug bolts are 5mm. Top cover bolts are 4mm and exhaust bolts are 5mm vs 6mm on the newer 044/440. The muffler casing is as thin as a husky muffler. The crank shaft is thinner on the weights and the rod is pretty spindly. The HD filter cover has no wings on the original covers and as mentioned the tanks have less molded braces and are a thinner plastic. The differences are on par with most of the models from that era compared with the later versions. An early 064 is very noticeably lighter than a late model one. An 034 is lighter than a later plastic tag 034 for all the same reasons. Most/all parts interchange but few are actually identical. The earliest models are the lightest and I'm guessing as they discovered weak areas they updated them and consequently gained some weight.
