Colt Detective Special - Need Advice

[GD2A]

Hey Folks

I'm interested in a gun that's on GB. The auction is up in a couple hours so this is time sensitive. If anyone has experience with Detective Specials, particularly those from the 70's on up, I'd really appreciate your thoughts on this listing:

http://www.gunbroker.com/Auction/Vie...Item=456112258

I'm interested in this but don't know enough about them to know what is the most I should pay based on the condition. I sent an email regarding bore, timing and lock-up. The seller said, the bore looks great and the rest is sound so far as he can tell.

Thank you, kindly!