I've never owned one but have seen a couple without it, even one Model 1903, an engraved Expert grade. Leaving out the rear dovetail was listed as a $1.00 option as far back as the 1897 catalog, changing location from standard also was $1.00. Most options for the 1899's were also offered for the 1903's when they were introduced.
This is from a later catalog, #24, from about 1909 - prices the same -
Probably not a very popular option since Savage also offered sight blanks for 25¢ and then you still had the option of changing to standard sights.