Schick Injector
Version 1

These were the first of the Type M adjustables. They were introduced in 1964 and produced to 1966.
They have "SCHICK ADJUSTABLE" on the metallic insert in the handle (See the middle picture below).

Type M Version 1 Type M Version 1 Type M Version 1
How does it shave?
I find it a very mild shaver low down and goes to Mild on the higher settings.

Type M Ver 1 SOTD Type M Ver 1 SOTD