4 UNCOMMON EARLY ROBERTSON SQUARE HEAD SOCKET SCREWDRIVERS

Regular price $110.00 USD

All stamped "P. L. ROBERTSON CO. LIMITED MILTON ONT. CANADA PAT'D IN CANADA 1933 " on their shanks along with what sized screw heads they were used for. Eg, both the green ones are stated to be used for "SOCKET SCREWS NO. 4-5-6" under the aforementioned stamp. The black handled stubby is even earlier with a patent pending stamp! And I have never come across the long green handled one before...

Includes the following:

Black bulbous handle
- 5 3/4" long
- Additionally stamped, "WORLD'S PATENTS PEND."
  - For use with size 10 – 14 screws
Red handle
- 8" long
  - For use with size 7–9 screws
Green handle
- 8" long
- 16" long, very fine condition
  - For use with size 4–6 screws