Schick Injector updated information addendum - M to O Type M Schick Adjustable produced from 1964 - 1982 I am going by the handle stickers to designate the razors for the moment. Type M3v1 1964 - 1966 Type M3v2 1970 - 1973 Type M1 produced 1966 - 1969 Type M2 produced 1973 - 1984 also referred to as the protector on the packaging. M3v1 handle sticker says Schick Adjustable, adjustment dial sticker sold with and without a black dot in the center M3v2 handle sticker says Schick Adjustable, adjustment dial sticker w/o black a black dot in the center M1 handle sticker says Schick Dial, adjustment dial sticker sold with and without a black dot in the center M2v1 handle sticker says adjustable by Schick, adjustment dial sticker has cross in center M2v2 handle plastic no sticker says Schick as part of the handle, adjustment dial sticker has cross in center First instance of an M3v1 Ad from the Indianapolis Star Sept. 4th 1964 Indianapolis Star Second instance of an M3v1 in 1965 showing the center dot on the adjustment dial Ad from the Kansas City Times Jun. 3rd 1965 Kansas City Times Click for full page First instance of the M3v2 with the new dial sticker without the center dot. This sticker style disappears from the adjustables and doesn't reappear again until 1970. Ad from The News May 26th 1966 The News Click for full page First instance of the M1 Ad from the Lancaster Eagle Gazette Jun. 15th 1966 Lancaster Eagle Gazette Click for full page Here is an instance of the M1 with a black center dot on the adjustment dial Ad from the Courier Journal Oct. 27th 1967 Courier Journal Click for full page Last instance of an M1 Ad from the Selma Times Journal Dec. 28th 1969 Selma Times Journal Click for full page First reappearance for an M3v2 Ad from The Democrat and Chronicle Sun Apr. 5th 1970 Democrat and Chronicle Click for full page Last instance of an M3v2 Ad from the Albany Democrat Herald Feb 20th 1973 Albany Democrat Herald Click for full page First instance of the M2 Ad from the Lebanon Daily News Aug 28th 1973 Lebanon Daily News Click for full page Last instance of the M2 being sold Ad from The Democrat and Chronicle Sun Dec. 30th 1984 Democrat and Chronicle Click for full page Here is a later model M2v2 so we can see how the handle differs. It came in two styles one with the razor head having a Schick logo stamped on it and one without. The one without is most likely 1980 - 1982 and the one with 1982 - 1984 since that is about when the Type N razor appears and is also when that style of logo first appears on an injector.