Rendenbach soles 6 mm, pre-cut in the tannery (not from split bends)
Cognac and white (deep inside, almost not seen) leather was used for lining
The tongue is sewn into the lining at the inner side of a foot
I visited Mr. Januszkiewicz last week and can share some recent numbers for chukka boots similar to the one shown in post #54 of this thread. The cost was 2400 PLN plus 90 PLN for the shoe tree. Shipping was at cost and the expected arrival time as 8-9 weeks. As I did not speak Polish, he had to ask a neighboring merchant for translation help and thankfully the person assisted.
I'm not sure why the cost was 33% more than that quoted in the original post but it could be several things: the leather used, an adjustment to the relative strength of the USD (up ~25% against the PLN since 2010) or the result of increased demand. At the end of the day I wasn't bothered by it but I thought others might be interested in current prices. He is a very nice and accommodating man, as I found many Poles to be.