Here's what I could round up out of the wrench dungeon. the Diamonds are listed in what I think is chronological order (oldest first).
1. 5.75" DIAMALLOY - DULUTH USA / Rev. U.S - - With expanded jaw tips and pincher style wire cutters.
2. 5.75" DIAMALLOY (in diamond logo)
HANDIMAN - DULUTH USA - / U.S - - With expanded jaw tips and pincher style wire cutter.
3. 6.5" DIAMALLOY (in diamond logo)
HANDIMAN - DULUTH USA - / MADE IN USA - - With expanded jaw tips and pincher style wire cutter.
4. 6.5" DIAMALLOY (in diamond logo)
HANDYBOY - DULUTH DH16 / Rev. FORGED IN USA - - With expanded jaw tips and pincher style wire cutter.
5. 6.5" DIAMALLOY (in diamond logo)
HANDYBOY - DULUTH DH16 / Rev. MADE IN USA - - With expanded jaw tips and pincher style wire cutter.
6. 6.5"
DIAMOND HANDYBOY - DH16 - USA (in diamond logo) / Rev. USA (in diamond logo) - - With thicker jaws and scissor style wire cutter. NOS in original box.
7. 8" DIAMALLOY (in diamond logo)
HANDYBOY - DULUTH -
DH18 - USA (in diamond logo) - - With thicker jaws and scissor style wire cutter. NOS on plastic covered card.
8. 6.5" DIAMALLOY (in diamond logo)
HANDYBOY - DULUTH - DH16 - USA (in diamond logo) - - With thicker jaws and scissor style wire cutter. NOS on plastic covered card. Card states "Proudly Made in USA by Skilled Craftsman".
9. 8" unmarked rip-off with thicker jaws and pincher style wire cutter.
10. 5.75" marked only U.S. - - Older style with expanded jaw tips and pincher style wire cutters
All have 4" size Crescent type heads except Nos. 7 and 9 which have 6" size heads.
Nos. 1, 2, 3 and 10 have rivets holding the two halves together, the rest have bolts and nuts.
I purchased a local hardware store in 1981 and one of my suppliers still had the Handyboys listed in their catalog. I ordered a few pairs of both sizes and received them on cards like Nos. 7 and 8. But when I tried to reorder a few months later they were out of stock and could not get anymore from the manufacturer. I don't know exactly when Diamond stopped making them.
I have been told the ones marked "U.S" were for the military. Anybody know if that is correct?