The other side is marked “CRUCIBLE STEEL BIT.”. Antique Bridge Tool Co single bit axe head with phantom bevels.
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parts – 1-5/8″ No 2 size iron blade cutter for Bridge Tool St Louis wood plane
It is marked with “BRIDGE TOOL CO ST LOUIS USA” on 2 lines. I didn’t get a chip breaker with this. It will want a sharpening. So I won’t do that for you, or to you.