Hey Dave , couple of thoughts ,since you are new at this.
Guys seem to get too hung up on years of manufacture. Maybe more important on older ,much older guns, not so important on newer guns.
What is MUCH more important is the Dash number which will explain plus or minuses of that version of the model. As a secondary plus the dash number will significantly narrow down the date of manuf.
Number you have used does not seen to be a serial#, possibly a assembly number which is meaningless .