verify the serial number compatible with 40-191
A quick learner says:
January 9, 2015
Paul from SWISCO responded:
January 13, 2015
Our 40-191 Pella mortise locks do not have serial numbers stamped on them. The best way to determine if it will work for you is to compare our dimensions to your own. If they're the same, then I think you'll be good to go.