@RugerM77 hmm just grabbed her Royal Highness the Queen from her safe throne to check out those bases.Have noted my pair mounted on this BSA don't have the (rear?) Stepped bottom face .So now retracting my quess.Turns out I'm not a Noah after all.If the brains trust on here can't solve the riddle,then maybe a couple of happy snaps sent to the good ol boys @ Conetrol in Texas might be able to I.D. them
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