Radiophile.com - Mayfair TR-1964

Mayfair TR-1964, ca. 1964

Approximately 9-1/4 inches / 235 mm wide, not including the strap brackets on the sides.

This recorder is unusual in a couple of ways:

It takes only two "UM-2" (C size) batteries, which power both the motor and the electronics. Most cheap recorders use two C cells for the motor, and an "006P" (9V rectangular) battery for the amplifier.
Although it's a rim-drive, it uses an idler wheel to transfer torque from the motor spindle to the take-up reel turntable. I think this method provides better speed stability, although it is still unsuitable for music. (It must have provided some benefit, or the manufacturer would not have done it.)

It's fun (at least for me) to collect the myriad made-up brand names that were affixed to these small Japanese recorders. The names were probably applied to the manufacturing output of just three or four companies, judging by the similarities among the surviving recorders found today. So far, mostly from devoted eBay watching, I've collected this list of brand names:
Acme Afco Aiko Alaron Alco Alsi Answer Apolec Apolex Argent Belmont Biltmore Claricon Clystar Columbia Comet Commodore Consul Deluxe Continental Ehrcorder Electra Electro-brand Encorder Encore Fairmate Hako Hamilton Harlie Harpers Hiltra	HiT Homey Honeytone International Invicta Ionic ITI Jaguar Juliette Kent Kraemer Lefco Le Sabre Lincoln Lloyd's Marfield Martel Master-craft Mayfair Midland Miny Monacor Nipco Nobility North American Norwood Nuvox O.M.G.S. Pateks Pion	Poppett Raleigh Realtone Regent Rosko Ross Royco Sandy Senior Corder Shalco Snow Man Sonic Sonic-Aire Star Fire Star-Lite Starline Sublime Summitone Sun Ace Sun Mark Superior Tempest Toho Tonex Transicorder Transworld Travel Pak Universal Valiant World Tone