An interesting gun. If they didn't accidentally "duplicate" serial numbers here and there, and if 170-00000 was actually made (not sure that it was), that would be the 800,000th GP100 ever made. Would go great with 178-00000 which shipped in 2016.I saw a GP for sale today that may match somebody up for a consecutive pair. It's 177-99999.
PM me if you want the contact info of this local store.
I've NO connection with the gun past noting the s/n.