I've attached a summary of the variations of the Andresen, Western Importing and Griswold plett pans. Any of the Andresen pans are over 100 years old and of good quality. The first Western importing pan is nice.
Griswold BN1-4 are very nice, high quality pans. BN5 is pretty decent and likely the last made in Erie. BN5 (marked 2980A) is very common but sells for stupid high prices. $40 would be more than enough for one of these.
Beginning with BN6, these are made by Wagner with the Griswold name on them. Not as desireable but work just fine. Wouldn't pay much for them.
This is just a summary of the information that is available to members. If the pan you saw is a BN 1 or 2, $65 isn't that awfully high. Top of market, but nice, uncommon pans.
Tom
(p.s., I had to really compress this so the detail is poor. If you can take a picture of the pan you are interested in and I'll tell you more about it.)