A.D.: Yes, it is indeed a FPE disconnect switch. The only real difference is that the operating handle is mounted on the front cover (instead of the traditional right side). I'm not too sure how old these are, but a Baptist Church built here in the late 70's is full of these things...some with fuses, some without (with OCPD FPE "circuit breakers" [Linked Image] located elsewhere).

Mike (mamills)