National Match barrel symbol

[Durango56]

Does anyone know what this symbol is to the right of 1961 NM triangle?
https://imgur.com/a/Su08nbv

Information

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[Durango56]

The rifle was sold thru Erie Ordnance depot. I was told that they sometimes stamped a heart on NM rifle that past thru , wondering if this was remnants of heart symbol.

Heart symbol
https://imgur.com/a/weVdxb1

[Mark in Rochester]

From post by Bob Seijas

Annual Marks - http://www.milsurps.com/showthread.php?t=35777
1959 = Greek Cross, looks like the block Red Cross symbol
1960 = 4-point star, looks like the stars in the Pittsburgh Steelers logo
1961 = Triangle
1962 = 5-point star, usually part of NM star PT in a row
1963 = 7791036 NM barrel without annual code in the chamber area

[Bob Seijas]

AFAIK nobody knows. I assume it is an annual code like the other marks that I can identify. At one time I speculated that it might be a Rock Island code used after SA stopped making NMs in 1963. That's the only thing I can think of. No documentation has yet been found. It is sometimes found on the late 7781035 barrel not used until 1962/63 so it's late.

[Mark in Rochester]

Incorporated in 1955 - I wonder???

Hart Rifle Barrel Co.
1690 Apulia Road
LaFayette, NY 13084

[Rick B]

AFAIK nobody knows. I assume it is an annual code like the other marks that I can identify. At one time I speculated that it might be a Rock Island code used after SA stopped making NMs in 1963. That's the only thing I can think of. No documentation has yet been found. It is sometimes found on the late 7781035 barrel not used until 1962/63 so it's late.
Attachment 129004

Bob That was my rifle some years ago and my leg in that picture. Here is a pic of the paper work that came with it from Rock Island and the pick up order from DCP in Port Clinton when ready.. Rick B