Just trying to get the years right on some door handles I have.

Flying Buttress 1968-1969?


Convex Handle 1966-1967? The lock cylinder curves out. Just like the 1968 lock above.


Concave Handle 1965? The lock cylinder curves in.


From what I have read here, the lock tumbler of the concave and convex handles are not interchangeable.

thanks,

eric