Plain edge means there is no text on the edge but I have no idea about some obscure pearl etc.. What I would like to know what the ‘mistake’ is. That the line exists, that the coin exists? Right now this year line comment is worthless.
Oh sorry, I've messed up the pictures, now it's on top of the hairnet:
Hahaha, just kidding of course, but in the mean time I've found out what's it all about. But I can already tell you it has nothing to do with the hairnet.
I have unraveled the secret. There's a whole story behind it. I'm now taking pictures but I can already tell you the coin on the Numista coin page has a secret pearl too.
Very interesting , this is the first time in decades I have heard about this.
You're right Ole. ALL the silver guilders have a secret pearl, but the 1954 also exists without that secret pearl.
The goal was to make it more difficult for counterfeiters. As long as they were not aware of that secret pearl you know if you have one without the secret pearl it's a fake (except for the 1954 since that date exists without that secret pearl too).
As you can see they started in 1954 with a secret pearl right on top. Every year, the secret pearl moves one pearl further, till the last silver coin in 1967. The nickel guilders don't have a secret pearl anymore. This also means, even when the date is for some reason (damage) no longer on the coin, you know from which date the coin is on the basis of the placement of the secret pearl, but don't forget, every year the coin was struck the secret pearl moves on one position further but some years the guilder wasn't struck. So to know the date on the basis of the placement of the secret pearl you also have to know which years the coin was struck.
Also ALL the silver 2½ guilders have a secret pearl, every year one position further, the nickel 2½ guilders haven't a secret pearl:
Great work, this was an interesting question from the OP and I was following it (unfortunately didn’t have time to research myself) but top work Essor Prof well appreciated, now I have to go and make sure all mine are real and not fake! Unfortunately don’t have a 54, so can’t be looking for one without.
„If your reply or post in the Forum stinks of AI, I will call you out! Knowledge comes from experience, the I in AI stands for incompetence.“
The 1 Gulden 1922-1945 (N#6070) is a new type so the secret pearl starts again on top above the cross, moving again 2 positions after each year it was struck. The 1944P and 1945P weren't struck by the Royal Dutch Mint but by the Philadelphia Mint, so these dates don't have a secret pearl:
The 2½ Gulden 1929-1940 (N#6551) also has a secret pearl, but this time it moves every year 1 position but counterclockwise. Although between 1933 and the next date 1937 the secret pearl moved 2 positions (no idea why, maybe because there was a break between 1933 and 1937, although they never did this for other types where there was a break in striking):
Here is my first try with the 1 gulden 1954 to 1967. Try to see, if it's like you would like to see it, I haven't the room for all the images, so I invented a “system”!
Well, well, well, we learn something new every day. It turns out there is even a second authenticity feature on the Netherlands 1 gulden 1954-1937, KM# 184. It's not as easy to see as the secret pearl but I checked with an 8 x magnifying glass and I could clearly see it.
The second authenticity feature: there is a notch on a letter on the edge lettering, for every date another letter. The notch is half way the letters on the left side (click to enlarge the picture):
I'll try to make some pictures of the coins themselves later.
Thank you very much Ole. I was very busy lately (my daughter is moving out her new house shortly and the whole house had to be emptied and painted) and didn't have the time yet to take pictures but now you did. It's more difficult to see than the secret pearls but you can indeed see all the notches are there.
I hope your daughter enjoyed you helping her. Once I stayed 6 weeks in the US helping my daughter to move from Washington DC to Oklahoma City….
The letters on the edges of the Dutch coins are not all the same size, and you also have pos A and B, so my images are looking like taken by a drunkard!!!!
Netherlands • 1 Gulden - Juliana
