The aim of this is to update and clarify best as possible the various style of adjustable injector razors and when they were produced. Using dial and handle stickers strictly to date the razors is not really since they weren't used in a linear fashion for the most part. The only consistent delination is the addition of the guard lock originally the proctector feature on the razors in 1973. Any razor without is 1964 - 1973 and any with is 1973 onward regardless of handle or dial stickers. I am going to drop Appleby's designations outright except for calling them Type M injectors and instead identify them by a combination of the style of dial sticker, handle sticker and guard feature. Keep in mind there are a few stragglers out there that are not representative of the packaging. I will elaborate more on those towards the end of this write up. Now to define the razor characteristics Dial stickers D1 black dot in middle D2 no black dot in middle D3 cross in middle D1 and D2 in advert on the left, D3 on the right Handle stickers H1 Schick adjustable H2 Schick Dial H3 Adjustable by Schick H4 no sticker H1 on the left H2 middle left H3 middle right H4 on the right Guard Protector lever G1 without G2 with G1 on the left, G2 on the right. Now onto the combinations and years produced. As far as how each shaves compared to each other is unknown and outside the scope of this synposis.