This is actually pretty common with pre-staunton designs. I recall some years ago the House of Staunton's antique section had some pictures of a Regence without horse heads and the Knights and Bishops were reversed. I emailed Frank Camaratta about it and he just told me he agreed with me, they were reversed, but the pictures stayed as is, so looking at the beginning of this thread seeing people try to confirm which piece is which based on pictures of how other people have set up the board was somehow less than reassuring.
Which piece is the king?
One more note (I'm not sure if anyone has mentioned this yet and it doesn't help that the Bishop top looks similar in Regence sets too) in a lot of pre-Staunton designs the Queen is a "big pawn" and will have the same or similar piece signature on top as if one of the the pawns has promoted and become taller.

@quadibloc, thanks.
Yes, the doubt was serious. It started when I visited a chess museum in Amsterdam earlier this month. The museum had several chess sets displayed on boards, including two of the regency type. In both cases the pieces with the crown were on d1 and d8.
Because I doubted this was correct, but wasn't 100% sure, I asked three of the people working in the museum. None of them knew the answer.
I think you find that half the time people that work in the chess museum in Amsterdam , Do not have a clue ?
As there work for free ! Nice Library .
@quadibloc, thanks.
Yes, the doubt was serious. It started when I visited a chess museum in Amsterdam earlier this month. The museum had several chess sets displayed on boards, including two of the regency type. In both cases the pieces with the crown were on d1 and d8.
Because I doubted this was correct, but wasn't 100% sure, I asked three of the people working in the museum. None of them knew the answer.