Dear David,
first of all, thank you for the possibility to get a step out of confusion by aid of your vids and your book "Learning the tabla", which I bought here in Hamburg in a local music store.
I am impressed about your proficient and elaborated answer according my question. This is very helpful for all.
Now what I can say furthermore about this unusual pair is this :
There are no written marks on the shells. The bayan shell is not metal or clay it is made of wood.
The dayan is made from red gleaming wood and lightweighted,because it is nearly entire skimed . The mark of the collet chuck identifies an old english turning lace (this was told to me from a wood turner. Unfortunally the reheading was finished, so he was not able to tell me something about the woodkind). The outer shape is more cylindric, and 2 inch higher than my other 5 inch dayan. The upper brim is carefully rounded to the outside, much more than I have seen at other shells.
The pudi is now a standard 5 1/2 bombay style, noname, with a little blue premium quality chop inside, my teacher choose carefully in the fourth shop after we visited 3 shops in 5 hours, out of a plastic bag filled with a lot of pudis in different sizes.
The sound of the set is interesting (no, deep, not like a djembeh

).
Dayan is on "d" like my neem - wood dayan. It resonates more in the mids, than the neem wood one. The tet sounds warm, and has another sustain. Fast play ( as fast as I can as a beginner) causes a little melting of the bols, not disturbing, but different. All in all I would say "The sound is not so dry, as the common ones".
The Bayan produce a Ga sound like "BOUUu ". My brass shell Dayan does it like "BOOMMm.
I bought this pair from an Afghan. He told me, they are from a friends dead father. I forgot to ask wether he know when they came to Germany.
Today I met an Afghan Harmonium Player, he told me that he remembered this kind of tablas from his childhood in Kabul.
According to David´s appraisement , I would assume that they came from Punjab to Afghanistan, from where they were brought to "I don´t know" and at least to Germany.