PA24,
Your recommendation regarding the original posters' question are totally inaccurate and misleading when it comes to what the LCSCA letters contain. For your information, the LCSCA records are EXACTLY what appears in the Cody records--- with the exception of extensive, painstakingly additional research recently done and published by the LCSCA Archivist. As a consequence, if accurate, up-to-date information is needed on Smith guns, the LCSCA records are where it's at !
Back to the original posters' question, JDW's answer is most likely correct. I recently researched a OO 20 ga dated 1912 that appears in the records in a midst of 20 ga. Fields---- not an uncommom occurence during the "transition".