Trying to date my new NDC's

[azelyk]

I recently picked up two no date code gillettes. One old type with case and blade bank, and a ball end tech. I was hoping someone could provide some insight into the time era. I did a little research using mr.razor and it seems the Old type is 20's era maybe, and the tech is 40's but I was hoping those who are in the know could nail it down a little better.

Pics here
Old Type




Tech




Thanks for the help guys.

 

[nuclearblast]

The Tech is most likely a '46-'50 model, and the Old Type, as you said, from the 20s it is.