For more info on the Swinden Key System, read the following thread:
http://www.allaboutpocketknives.com/kni ... it=Swinden
More Swinden info:
http://www.allaboutpocketknives.com/kni ... en#p114939
On the 2nd page of this thread you will see a disassembled Swinden knife.
http://www.allaboutpocketknives.com/kni ... en&start=0
Yes, if they were slipjoints (as opposed to lock backs like the LB series) and they were made in the Schrade factory after about 1962 or so. Some Old Timers, Uncle Henrys & Ulsters were made by Camillus and likely some by Imperial, those will not have the Swinden Key as the Camillus and Imperial factories did not have the Swinden machinery.pinnah wrote: All of this to ask, did the Schrade Old Timers and Uncle Henry knives share this key hole construction? Did all Ulster's use this construction technique?