On page 241 of "Mauser Archive", 1927 inventory list shows 8 instances of "7,63 Cal 9m/m 1000". Since they are rare enough, that would explain why we have not seen them. But the possibility of being 9x25 still exists.
Other 7,63 entries must be Bolo Mausers, came with either 500 or 1000 sight leaves, as we commonly met today.
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