I have a Savage 23-B SN#83,XXX and the best I can tell it was made around 1926 to 1928. The 23-A, 23-B, and 23-C were made at the same time with no regard to the number used between them, just whatever the next one-up number was. So, with all that have being said, I think your 23-A was made between 1927 and 1929. I've read it here before but, it bears repeating "With Savage, you never know".