This catalog is called #SC2.  I am guessing that this was Corbin's attempt at paring down their product offering to appeal to a more after-market type of customer.  Given that Corbin's main focus was on the new construction market, this catalog has in it the items that might appeal to those selling hardware into the replacement world.

There is no indication of the date it was published, but we know that there was a catalog #SC1 printed in 1967. So this catalog, with the number being SC2, must have been published not long after 1967.