It was established in 1890 by Victor Carroll Squier in Battle Creek, Michigan. By 1975, Squier became defunct as a manufacturer and a brand name for strings, as Fender opted to market its strings under the Fender brand name.
The short scale may improve ease of use for people with small hands, and also enhances the ability to use the tremolo arm for upbends.
After the release of the Mustang, the Musicmaster and Duo-Sonic were redesigned using the Mustang body; These were branded the Musicmaster II and Duo-Sonic II but the decals were not consistently applied.
All three Mustang-bodied models (Mustang, Musicmaster II and Duo-Sonic II) were offered with optionally the 21 fret 22.5-inch (or 3/4 scale) neck, or a 22 fret 24-inch neck, but the 24-inch was overwhelmingly more popular and 3/4 scale examples are rare.
These stamps can be found in differentlocations on your guitar, so now I'll tell you where you need to look to find these markings... acronym for "Japan Vintage" On these guitars you will find the letters "JV" stamped/engraved into the neck plate of the Stratocasters and bass guitars and on the bridges of the Telecasters and other guitar models.
There will be 5 numbers also engraved after the "JV" lettering.