Glenn, welcome to the forum!
Although a reblue and all, we can figure out its original info. We would need a lot more information than you didn't give us
Serial number, including suffix, year, toggle marking, proofs, acceptance markings etc.
Yes, a 3 digit is acceptable, thus the reason for the suffix on the front of the frame, if it has no suffix, then it was the xxx made that "year", although there are exceptions to this, and as I said, we need a lot more information.
OOPS, sorry Glenn, missed the pictures at the bottom, I usually look for pictures posted here, not picture bucket or whatever it is called
It is a 1917 DWM, so suffix depends on when it was made, if only a 3 digit, then it was made the first week or so in 1917, if with a suffix, then every 10k the number started over with a new suffix.
Ed