Here is some info I found on another forum, the guy said it came from Joe H

Still not finding an answer to the swinging sheath question from earlier.......
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Hello. The Buck 124 was originally designed as a diving knife and called a Nemo. It started its life somewhere around 1967. The original prototype, around 50 or so, had a hole centered in the pommel. They are extremely rare!!!
This was followed by a production model that was offered in 1967 with either a diving sheath (NEMO) or a flap leather sheath (FRONTIERSMAN). Both were the same knife, other than the sheath. They made roughly300-500 of these and they had black phenolic handles with white teflon spacers.
1967
Black Phenolic wrap around handle
Stamped BUCK, U.S.A.
Plain edge, no serrations
Stainless guard, varying thickness, one piece stainless butt, one visible rivet
Lanyard hole on end of birds beak pommel
Red bone hard fiber spacers
Plastic Nemo or leather sheath.
Larger 2 piece off white box for Nemo and Frontiersman.
1969 to 1970
Black Phenolic wrap around handle
Stamped BUCK, U.S.A.
Plain edge, no serrations
Stainless guard, varying thickness, one piece stainless butt, one visible rivet
Lanyard hole on end of birds beak pommel
Red micarta spacers
Plastic Nemo sheath or leather sheath.
Unknown box style.
1971*
122 temporarily discontinued late in this year
Grey/black Buckarta micarta, heavy grain slab style handle.
Upside down stamp. Buck, U.S.A.
Partially serrated blade.
Stainless guard and 2 piece butt with 2 visible butt rivets.
Lanyard hole
Swinging leather sheath.
Unknown box style.
1972
Grey/black Buckarta micarta, heavy grain slab style handle.
Upside down stamp. Buck, 124, U.S.A. 122 may exist with this stamp too although no 122 were made in 1972.
Partially serrated blade.
Stainless guard and 2 piece butt
Lanyard hole
Swinging leather sheath.
2 piece yellow box.
1973
Nemo back in production.
Grey/Black or just black Buckarta micarta handle.
Right side up stamp. Buck, 124, or 122, U.S.A.*
Partially serrated blade/122. 124/ plain blade.
Stainless guard and 2 piece butt/ 122. 124/ aluminum guard and butt.
Lanyard hole
Swinging leather sheath.
2 piece yellow box.
1973
Nemo discontinued for good.
Tight grain black or red micarta, blocky or squared handle shape.
Three line stamp, 124 only from here on.
Plain edge from here on.
Aluminum guard and 2 piece butt.
Lanyard hole.
Swinging leather sheath.
2 piece yellow box.
1973*
Black Buckarta micarta
Three line stamp.
Aluminum guard and 2 piece butt.
No lanyard hole from here on.
Swinging leather sheath or Snoopy style.
2 piece yellow box.
1980
Black Buckarta micarta
10,573 units sold
1981
Black Buckarta micarta
7293 units sold
1982*
December
Pakawood (impregnated birch) handle
4705 units sold
1983
3850 units sold
1984
4688 units sold
1985
5206 units sold
1986
Three line stamp, BUCK, 124<, U.S.A.*
Date code after model number from here on.
4724 units sold
1987
6143 units sold
1984 to 1987
Stag handle 124 was offered with a slab style tang, aluminum guard and butt, with a suggested list of $230.
Hope this helps.
