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It's hard to tell with those GEM's - they were produced over a long period. The Clog-Pruf turned up towards the end of the SE era, though.

The Tech should be easy. On the underside of the head,...

The injector is an 'L' Type Schick, I think (I could be wrong) - it should be pretty mild, but it is a good shaver. You can still get blades for it at CVS and the like.

The Micromatic is the...