I've seen this marking a few times on Bren mag parts, mainly the spring, but also on other parts such as the plate which fits on the end of the spring and sits below the mag end plate. The upper part of my example has not been fully struck, unfortunately. The vertical part of the "L" should extend above the top of the "B". It basically looks like a slightly different version of the Long Branch combined L and B. While I don't think it is a Long Branch marking I did wonder if Lines Brothers ever used a combined L and B trade mark; their markings were always two separate letters as far as I am aware.Information
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