70's Trilliums were equipped with Bargman L-400
My recently acquired '78 Trill 1300 would not lock from inside.
Disassembled lock set to find a bent lever in the mechanism.
Could not figure out how to repair properly so I bought a
NOS one (New Old Stock) on Ebay. It works great. The locking
lever internal design is different than the original one.
The interior photo shows stress cracks on the door from 30 years
of use/slamming the door? Had a '73 that did not have any cracks
around the lock.