It is a Japanese made made machine. The Belvedere / Adler is who sold it, not who made it.
The
J-A 18 indicates it was made by Riccar or possibly Toyota.
It will use standard Class 15 Bobbins and bobbin cases.
Needle system: 15x1
On needle packages you'll find this info:
Singer: 2020 (15x1), 2026 Denim/Jeans, 2045 Ball Points
Schmetz: 130/705H 15x1H
Organ: HAx1 130/705H 15x1
From your pics I can't tell if it's low shank or a high shank machine so go to Sew-Classic and read up on their section on how to determine that.
It also may be a left homing machine (needle parks to the left on straight stitch) as I don't see a L-M-R lever or knob. A regular ZZ foot of the appropriate type will work as you have a ZZ needle plate.
You'll need a presser foot thumb screw and a needle clamp.
You "might" be able to find all of these at Sew-Classic {
http://www.shop.sew-classic.com/ } if not you'll need to hit up all the local sewing machine shops and or eBay.
Good luck on your project.
Joe