It's the so called reputable gun dealers that I've had the most trouble with....they just won't tell and hope that you won't see it....Then they come up with some lame reply or offer to cut the price alittle more.
My advise is ask lots of questions and if you don't know what you are looking at....find someone who does and has the tools to measure the bores....and that is easier said than done.
Some of the guys at my gun club are gun shy of me...they don't want me going over their purchases. Then others ask me to help them look one over...I looked over a vintage English hammer gun last week with a buddy it was priced about 4 grande it had some glitter but was over priced by at least $2500 bucks in my oppinion. As a shooter I'm not sure I'd be interested at $1500 bucks.
Cleaned action.....steel barrels with scatered blued over pitting on the outside of the barrels some bad some not so bad.....a couple of spots of deep pitts in both barrels that were really hard to see (had to get outdoors and look at the sky to see them)....One barrel grew in the middle by 4 thousands ?........a couple of serial numbers didn't match....in my oppinion it was over proofed for the barrel weight and chamber thickness (blown out to 3" and re-proofed for 1 & 1/2 oz). blued hammers....the feel of the locks wasn't the greatest....long firing pin on one side short on the other....plastic butt plate.
What do you expect for 4 grande ?