I've serviced a good few Hamilton GG-W-113's over the past year and have become accustomed to various engraving styles used to designate their 17-jewel Cal. 649 ebauche ETA 2750. Some are even marked "seventeen 17 jewels unadjusted" with no mention at all of "H W Co Inc" & "649".
But, until today, I've never seen this style - the movement is from a one-piece case model dated May 1982:
The turned circle is about 2.4 mm dia, just under 1/10" !! The inked (?) lettering is not real sharp.