The 85 620 is a one off year for that design (except the 1986 "Cirrus 620" which was a leftover 85 with a silver head tube).

It's the most desirable of the Trek 620s.

I'm still running 27s on my 85 620- between Panaracer Paselas in 27 1 1/4 and the Sand Canyon 27 1 3/8 tires, there's some nice "classic" tires for that size.

In looking at this- the person who "converted" it did some work to it- not just dumping parts onto it. Those aren't the stock levers, and it's also not the stock headset cable hanger. It looks like they might have taken the "best bits" off of a lower end boom bike and put them on the 620- maybe because the owner was more comfortable with stem shifters and turkey wing brake levers...

In any case- if the stem and seat post aren't stuck= that's a great price. IMO- the 6206 crankset is one of the very nicest 110/74 BCD cranksets.