Camillus made the M Klein electrician knives, at least until 1952.
This is an S-card form the Camillus for a run of M. Klein electrician knives in 1952.
I got this card from Tom Williams when he sent me copies of numerous the S-cards form the Camillus factory.
It is a 1951 inventory of the number of dozens of electrician knives Camillus had made for M. Klein.
Notice the top line on the left; Camillus had made 416 2/3 dozen knives for Klein in 1948, & 500 doz. of another pattern also in 1948.
In 1950 they ordered another 500 doz. knives.
Though I don't know which models they were, I suspect they were the electrician's knife, the small rope knife & the hawk bill pruner.
These three patterns regularly appear with the M. Klein tang stamp.
At what point M. Klein switched over to Utica, I am not sure, but I suspect that by the 1970s they had made the switch, if not before.
I have seen 3 different Klein tang stamps and there maybe others as well.
There is the M. Klein tang stamp, which I believe is the earliest one and then the M. Klein and Sons stamp.
There is a third stamp on knives sold under the Klein name, it says; KLEIN TOOLS/CHICAGO, USA.
I have that stamp on a serpentine jack parts knife with 2 broken blades.