Should the "600 ducats" part of the Rudolf story be dismissed for good?

[stegu]

 Various nations (including the HRE) issued ducats containing ~3.5g of gold, but the exchange rate of silver to gold fluctuated over time, so doing the actual conversion from thaler to gulden to ducats is not straightforward. (I'll defer to Guzy's expertise here.)

Yes, conversion rates varied A LOT in the 16th century, but the intriguing thing was my discovery of some kind of several payment information where Carl Widemann was mentioned to have received the 500 thaler for the books in florin, in this case 600.

Due to limitations of space I wasn't able to include a picture of one of the account books in my paper, but here it is:

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