Taurus has offered the M44 for many years and I believe it is still in production. If you can get the serial number, go here and enter it. https://www.taurususa.com/find-model.cfm That should tell you when it was made.
Taurus has made 2 finishes that they call "Blued". One that we all know as blued was used by Taurus until about 3 years ago. Then they switched to some sort of spray on, easily worn off blackish blue cheapo finish that they still call Blued.