Who sold the Voynich MS to Rudolf

[ReneZ]

How do 500 taler relate to 600 ducat?

Upon a quick wikipedia check, I recognize that at the moment in question taler was 22.91g of silver while ducat was 3.44g of gold.

Hmm... well, had it been talers, Mnisovski would have said talers, not ducats, would not he?

500 Taler was close to 600 (gold) florins. 600 ducats would be some 10% more than that.

After 1620 the Taler was deliberately deprecated, so it even makes sense for Mnisowsky not to talk about Talers.
500 Talers was much less in the 1630's than during Rudolf's time.
Anyway, this is of course speculation.

600 ducats was roughly 2 kg of gold.
When Voynich asked 100,000 dollars for the MS, he was asking *a lot* more than that.
Of course, he did not manage to sell it for that price, but he sold one of the other MS's for 75,000 dollars.