So called, anyhow.

At the time, Stoeger marketed the post - M1910 as 'High Velocity'. Modern collectors refer to them as "M1925". Early .30-'06 examples (Sequoia) were stamped 'M1924'.

Unlike the M1900 through M1924 and M1950 onward, the post - M1924 rifles and stutzen manufactured prior to Model M1950 had no model designation stamped on receiver ring or elsewhere.

Your rifle may actually explain why Stoeger listed the 7X57 twice under "for the U.S. 1906 Cartridge, also..." in their 1939 catalog.