Sanyo M-W50K
This very rare Sanyo can play both traditional cassettes and micro-cassettes. It has 12cm woofers and 3cm tweeters. It measures 20" x 7.5" x 4.3", and takes six D-cell batteries. Most of its controls are hidden under a panel on top, including volume, balance, tone, function, band, stereo/mono, tape type, and mixing volume. The example shown in these photographs sold for $710 on Ebay on 3/2/2022.