Corbin skeleton keys-different series?

[Pschiffe]

Hi all, I'm searching for some keys for a friend; he is looking for Corbin Skeleton keys, specifically any in the Q series, which I know are already difficult to find. I came across some that are stamped with BQ and followed by numbers. This is the first time I've come across BQ, I was wondering are these there own series or part of the Q series? Sorry, I'm very unfamiliar with any of this. Thank you so much!

See my post of 17-10-16 from the archives:
http://www.antique-locks.com/showthr...-Skeleton-Keys

Pete Schifferli