I'm the possibly interested party the OP mentioned. I have a late model poly flywheel 066 that needs a new home.
It's a very nice 064, and I'm certainly not trying to pick it apart, but can any of you walking Stihl encyclopedias answer a couple of questions I have about it? First, based on the filter/cover style as well as the fan cover tag it appears to be an early version. But, the tank housing has the translucent fuel tank and modern fuel cap which makes me believe it must have been replaced at some point - does that sound right? Also, were the early versions offered with a 3/4 wrap handle like this one has? The handlebar doesn't really make me any difference, but I was curious.
Lastly, I'm not asking what anyone thinks it's worth, but generally speaking, are the early 064's valued higher or lower than the later versions with the squared-off filter/cover setup?