Anyone Collecting Dutch / Nl Coins, Or Need Assist?

What is the exact translation from the Dutch coin grading scale to the American grading scale?

Something like:

fr = VF20
zfr = VF30
pr = XF40

?

I am asking because I have seen numerous coins on Dutch coin sellers' websites that rate their coins say "Pr" while to me they barely seem VF. Do the Dutch tend to overgrade their coins?
Also, most of the coins I have seen appear to be thoroughly cleaned. Like they went in some sort of caustic silver polish bath.

Okay here goes, by the way that is a pretty rare coin you have there. It is called a "Rijksdaalder" or "Daalder of the Kingdom" translated freely. Daalder is the word "Dollar" originates from. In general, gulden coins from Willem the first, second and third are rare.

So, the American grading standards are more extensive than the Dutch, but to give you a quick view:

Goed (G) > G-4
Zeer goed (ZG) > G-8
Fraai (Fr) > F-12
Zeer Fraai (Zf) > VF-20
Prachtig (Pr) > XF-40
Fleur de Coin (Fdc) > MS

As you can see, there are no ranges used in for example MS state. That is why a lot of collectors in NL will get their coins graded by NGC or PCGS, to get the exact grade. But dealers and sellers very few use the specific grades.

And to conclude this message, here are some of my Gulden coins. That 1943 Rijksdaalder has a "D" on it. During the war, gulden coins were minted in the US, Denver and Philly to be specific. Hence the less sharp strikes, the Dutch mint did a much better job in those days:

That would be Pr+

While coin collecting becomes easier available internationally through internet, more and more stores and Dutch forums are using the grading scale from the US. I for one, am a collector of US half dollars, which are not commonly available here so I order a lot through ebay from the US..

Watch out for fakes indeed, not the 1 gulden(to small and cheap to make fakes) but the 2,5 gulden sometimes, and even more, the gold 10 gulden. Those have been faked a LOT, especially the 1897(Wilhelmina with long hair), sometimes in 14kt gold.

1840, 1863 and 1898 are commonly faked.

For 1 gulden the common faked years are: 1847, 1896 and 1929. Chinese junk..

I am curious if any of the contributors here from Netherlands know the auction house Corinphila. I recently participated (electronically) in an auction where they were selling a collection of mostly medieval Brabant coins. Hammer prices generally seemed rather high (I only managed to win one coin by opening my wallet a bit wider than I had hoped), but maybe this was a well-known collection, and I am finding that prices of high quality world coins are generally quite high everywhere..