3003 is a model number, I don't know them myself, but there were neoprene and micarta scales, with a couple/three different lengths, and squared off and rounded swedges. Steel is AUS6, or AM6 as it was called when used in Al Mars. I have one like that, with the SF insignia on the bolster and the round swedge, and I have an older one without the bolster image and a square swedge.