Mine is similar but no FARA and Navy Arms is on the sideplate only. I do have a mechanical compass like logo on the left side of the bbl and in it appears to be "Antonio Zoli" stamped. The trigger guard has the serial number stamped in it as does the butt plate. In the patch box is an extra nipple and the worm. Navy Arms was started in 1956 and I'm not sure when they started selling our guns or where they got them.

All I know for sure is mine is a great shooter, lots of fun, lots of smoke and large holes in targets(don't need binos to see where it is hitting)...

Let me know how your's shoots or if you learn it's date for sure...

Thanks
Doug