Gillette blade identification

The R2 looks awfully like a date code - but would put it in the 1971 (or 1946) - and 1946 is when the original "Thin" blade was first marketed I think...

edit: No - it isn't, 1938 was the birth of the "Thin" - the packaging was changed from Red/Black to Red/Black/White in 1946 though.