It's not very often one sees a dolceola for sale, I'd guess. If you have an extra couple grand and are interested, check
this listing. Even if you don't want to buy, it's worth looking at the type of instrument Washington Phillips quite possibly didn't play.
There are almost a dozen photos.
And here is some Yo'Tube of said instrument (in need of restoration, and weenies know who might be able to tell you about such things):
