After Seven Years, I Think I Got Hosed

I think your Chatbot needs a little fine tuning in this case (the date is Arabic), cause I think it is a real looking coin to me at least

It would be Numista#59645, AH-1255, year 14, corresponding to 1852 AD...

So I believe this is a genuine coin from what I see

On some Ottoman coins, the regnal year is above the reverse text; on other coins, the regnal year is on the obverse below the toughra. General rule of thumb, for most Ottoman-Turkish coins I believe the date is on the obverse, for most Ottoman-Egypt coins it's on the reverse.

Working out the AD date-equivalent of Ottoman coins requires some maths. For example, for your coin, the date of issue in the Islamic calendar is 1255 + 14 - 1 = AH1268; you then either do the maths or look up a conversion table to get AD 1852. The AH to AD conversion is never 1:1 since the Islamic year is only 354 days long, so their new year drifts backwards by a couple of weeks each year; AH1268 began on October 27th 1851 and ended on October 15th 1852, so "most of" AH1268 landed in AD1862.

In terms of determining the authenticity of your coin, a simple test is to weigh it. If the weight is correct, and the coin isn't suspiciously thick, then the coin is almost certainly made of actual gold, of more or less the correct fineness - so you're not going to be out on any money, even if it's not genuine. There is a strong tradition in the middle east of making fake gold coins out of genuine gold, simply to put the gold into a form that's familiar and acceptable to gold buyers.

There is therefore a strong distinction that needs to be made (which is not always obvious and which may be too subtle for AI to pick up) between a "jeweller's copy" and a "jewellery copy". A "jewellery copy" is intended to look like a gold coin for use as jewellery and is usually not actually made of gold, but rather made of thin lightweight brass, often with designs that only superficially resemble actual coins. On the other hand, a "jeweller's copy" is made of solid gold, perhaps slightly less fine than a genuine coin but nevertheless still "solid gold". Jeweller's copies may or may not have identifying marks on them denoting them as copies; for example, jeweller's copies sold in Dubai are required by law to have a mark of fineness stamped on them.

No, the accession date is 1255; this is the year that this particular sultan became Sultan, not the year the coin was actually struck. All coins struck in the name of this sultan have the accession year "1255" on them. The regnal year in which the coin was actually issued is on the other side below the toughra, "14". To get the actual date of issue, you have to add the regnal year to the accession year. Because 1255 was Year 1, not Year 0, you also have to subtract 1. Thus, the actual date of issue is 1255 + 14 - 1 = 1268. You can then convert that AH year to an AD year (or year-pair).

You'll have to ask the Ottomans why they decided to use such a convoluted dating system for their coins, but it's what they almost uniformly used on all their coins throughout their empire, so they were used to it I suppose.

Here is the obverse with the "14" circled, in case some folks cannot find it. and when doing the math, it is -1 because there is no 'year 0' (tha'st right, ain't it?)

Huge hi five to everyone who helped me decode my 100 Kurush gold coin! I'll admit, my initial anxiety had me convinced I bought fake mall jewelry!
Instead, you all gave this Dad a great lesson in Islamic math. Ha..and here our kids thought algebra was difficult I am grateful this community helped me figure this out.
With this group's help.&
it was issued under Sultan Mehmed V Re#351;âd. The math works out to the base year of 1327 AH + 14 regnal years - 1 = 1340 AH,
which is exactly 1922—the final months of the 600-year-old Ottoman Empire! Cooool a last year coin? Nice!
There is something special about letting the kids hold actual history in their hands especially during bedtime.while we talk about the "Sultans of Trade" and the old silk salt & spice routes. Thanks for saving my sanity and making me look like a cool history expert to my kids!
We're very grateful for allowing me to post coins.

the accession date is 1255, not 1327