No, you are being careful, and that sadly, that isn't enough...
... You actually have to live and breath the tiny nuances of the particular variation you are interested in, whether it is a 1K pistol or a 10K unit .. So, it means you have to learn, or find someone you trust that will share their knowledge... That's why you pay 40% or more for an honest gun from a reputable collector.. he has assumed the, (sometimes severe) knowledge expense for you in advance... But, that being said, you are the final judge... I've been there and done that on all levels.... as they say, "It's a jungle out there!"
best to you, til..lat'r...GT
BTW, This is the right forum! The guys here are straight shooters all! I've never had an issue with any member of this forum..... Good luck to you in your quest!