When did the blue rock appear on Pigeon Guns?
The information I've been reviewing and that has been shared in part here begs the question (at least for me) as to when the blue rock first appeared on one of the lock plates of the Pigeon Gun. My understanding is that earlier guns had two birds, and later guns a pigeon and blue rock, but at what point did the change take place...was it an abrupt change, or gradual?
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