Need feedback on these coins - Are they genuine

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I am by no means an authority on World Coinage, (heck, I have no idea what the second coin is), but FWIW, the 3 Gulden has the look of the Chinese fake Morgans (et al).

 

Wow. Some nice coins, danoomistmatiste. Decent photos too. Try to edit any future photos thusly -



The first one - the 1831 three gulden - looks good to me. If in your shoes, I'd want to weigh it (it should weigh about 32.298 grams). The diameter should be 40 millimeters. There should be a dash between the crown and the shield, which I cannot see on your photo but that doesn't mean it is not there. Check out https://en.numista.com/catalogue/pieces6552.html - the coin pictured there has the dash.

I will remain silent on the second one since I cannot read Arabic and the coin is not familiar to me. All I can make out is the AH date - 1299, which is November 1881 to November 1882. I think.

Welcome to Cointalk!
David

 

Yeah, I think I may be seeing what Beefer518 is seeing. Willem's hair just looks off for some reason; I cannot specify what it is. And the three in the 1831 doesn't look right. The weight and diameter are important. Is it magnetic?

Again, I cannot offer you anything about the coin with the Arabic writing.

 

I too think the first looks off somehow, maybe buffed or something?

 

Everything looks wrong. Don't think they are even silver for starters.

 

Thank you all. The second coin is (supposed to be) a 1 Riyal coin of Zanzibar.

 

First coin looks very wrong to me - the shape of the jaw is way off the genuine examples and looks "cartoon-like". (Someone with a computer trying to make a copy without much artistic ability.)
Second is more difficult to see what is wrong - the denticles in the rim look a bit deep and irregular? If it came from the same source as the first I would discount both.
Interestingly the Numista page for the 3 Gulden includes an Ebay listing for a similar coin that is also clearly a fake.

 

The Zanzibar Riyal is a $1,000 coin. The one you have pictured appears to be a questionable specimen available from at least one ebay seller from the The Russian Federation for $75.00. I have doubts about the authenticity.

 

Oh, my. Here's the lowdown on the Zanzibar - https://en.numista.com/catalogue/pieces18071.html. It should weigh 27.16 grams.

So, danoomistmatiste, if I may ask, how, where and from whom did you purchase these two coins from? How much? No specifics necessary. Ballpark figures.

Do you have access to a scale that measures to at least the hundredth gram? That, and whether or not magnetic, would provide quick diagnostics.

If your really curious, here are directions how to determine, within a reasonable degree, the metal content of those two. https://en.numista.com/numisdoc/determining-the-metal-of-a-coin-27.html - but again, you'll need a good scale.

 

Hint... you can find matching photos for both coins from the same seller on ebay.

 

Oh! That's not good news. Not good at all.

 

The 3 Gulden looks suspicious. Tooled,harshly cleaned,or copy.

I would weigh it and mic it... then get back with us.