I not sure what you mean by it being without a locking lug, the parts catalogs as far back as I have, Jan 1, 1924, show the locking lug on the left rear for all of them. The later parts catalogs have early parts listed for serial numbers under 204,048. I have a 25-20 (don't remember if that's the B or the C) that is in the 87,600 range and it has the lug. Check your PM's
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