$100 is cheap regardless. Looks bigger than a 62. I rarely/never get accurate sizing information from sellers. I might have gotten accurate sizing in 5 out of 750 bikes purchased.
Anymore I’ve given up on getting size information. I just jump in the car and drive. I’d check out the frame behind it too.
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Please don't confuse ebay "asking" prices with "selling" prices. Many sellers never get their ask price. some are far from it. Value is determined once an item actually SELLS. Its easy enough to check SOLD prices.