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Rothhammer, some belated replies to your questions :
M1908. The set back front sight looks original ;
M1924. My 7x64 does not bear any sign of having previously been a Sequoia 30-06, see the below photos. In fact I might be wrong when calling it M1924 in case this would only apply to Sequoia models, but until now I have called M1924 all models manufactured from 1924 in high velocity non MS-owned commercial calibers. Louis
I realized after posting that if your M1924 had been stamped 'SEQUOIA' originally but later rebarrelled, there would be no way to tell. The 'SEQUOIA' stamping would have been on the barrel itself.
Some references refer to the longer action MS's (other than the original .30-'06 M1924 'Sequoia') as M1924/25, M1925, or simply as 'High Velocity'.
web page
Stoeger seems to have listed everything MS over 41" overall length as 'High Velocity' in 1939, but they also had dropped the MS designations of M1903, 05, 08, 10. The 'High Velocity' rifles listed are all of the longer action (.30-'06, 7X64, 8X60, 9.3X62, and the coveted 10.75X68), but among the 'carbines' can also be found the .30-'06 and 7X57):

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