Gillette ball end tech, pre war due to the oval slots instead of the triangular slots, I believe. I have two
Bob - Is it just my eyes or does that head have a date code? It looks like it to me, but I can't make it out. If I'm right we'll have a much more accurate date.
Looks like the letter is an O. Can't see the number at all the O would be a 1969 if it is in fact an O