Chinese made two voice melodeon – 3 row treble buttons (in the keys of GCF) and 12 bass. This was sold by Gear4Music as a second, because it was badly out of tune. I tuned it – the factory tuning was terrible – so you can see/hear it in the video below.
These are great boxes if you can play a two row melodeon , but can’t afford ££££ for a Hohner Corona. The three row melodeon is a modest step up from a two row, because the fingering for each row is exactly the same as you find on your two row. You can also play across the rows exactly as you do on a two row, but with the added scope of a third row.