SRS entry SA or RIA?

[RCS]

Check the production records for Rock Island, your serial number RIA 197478 may not have been manufactured in 1906.

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[RT Ellis]

Check the production records for Rock Island, your serial number RIA 197478 may not have been manufactured in 1906.

Serial number falls in the range for a SA rifle, now why didn't I think of that....?

[RCS]

This was the photo that I remembered and just found, as I wanted to post it with my answer. These are original rifles.

Rock Island s/n 64145 with RIA 3-07 dated barrel

Springfield s/n 160963 with SA 2-07 dated barrelAttachment 82998