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Until now I have seen that enigmatic „T in circle” mark only on military production Mannlichers and Mannlicher – Schoenauers, never on rifles from Steyr civilian sporting rifle production...

...I don’t believe in that “Tiegelgussstahl” explanation. If you look at the “T” closely, it may be two Ls back to back as well. I rather believe it to be a Steyr factory internal inspection mark, used on their military rifles built for export.

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Mysteries of the Mannlicher Schoenauer.

Either way the 'circle double L' or 'circle T', whichever it may be, would be appropriate for 3DogMike's 1909 manufactured Y1903 to have been 'sporterized' by Gibbs in 1911.

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