It may be stamped but it doesn't look like it was part of the original die. For one thing the curvature of the lower end isn't smooth. Its less of a L and more of a hook like a backwards J.
It may have been stamped as an identifying mark by a previous owner.
Its Sans Serif so I don't think it was from an English language set of lettering dies, also too sharp. Has a vaguely Indian or Pakistani look to it.
I've seen BSA made Enfield rifles with the range markings on the sights done in IIRC "Gupta" and the numbers resembled this in a way. I'll check on the fonts and get back to you.
