They are made between 1983 and 1988.
Btw: Are you TMG from Germany?
"JMB" = Jazz Model Bridge
As for the OP's pickups, those are clearly from the '83-'85 time period. As Beaubrummels mentioned, anything pre-'83 will typically have an unstamped baseplate (no logo, just the ink-stamped label).
Nice find, by the way! The classic "Hot Rod" set![]()
I pointed out above, thought it was "John Milner."