Glug,
I have a similar instrument, a late 60s early 70s Giuletti LMH, 41/140 PA, Mod. F74.
It's as Paul said. Starting from the bellows side: minor third, major third, fundamental bass, major chord, minor, seventh, diminished.
I got it because I liked the sound of it,?
The row of minor thirds is pure indulgence, since they could easily be played by reaching down with the little finger. But, as Balkan music uses quite a lot of them, it makes life easier, I guess!?
"So the row nearest the registers is an extra bass minor third row, and the other six make up the normal Stradella bass."
Yes?