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Thanks. Mind at rest now!

I don't know if anyone else is familiar with private issues, but it certainly isn't a Royal Mint product. The design is too coarse and has all the attributes of a modern strike. We aren't going to resolve it tonight.

Based on what you gave as the dimensions - 14mm diameter and 1mm thick, that has a volume of 3.1428 x 7 x 7 x 1 cubic mm. i.e 154mm3 ish. Density of gold is 19.3g/cm3 so with 1000 mm3 in a cubic centimetre (10 x 10 x 10), 0.154 x 19.3g will be the weight if in gold. It works out at just under 3g, which is close enough given your measurements are not exact. If the one next to it looks to be the same dimensions and weight, then that won't be gold either. Maybe it is a private gold issue - I can't say without having it in hand, but if so it is unlikely to be worth any premium to melt value. If it was 0.5 mm thick then we might be getting closer to the possibility of it being gold.

That confirms it isn't gold if the numbers are remotely accurate. If it was gold it would be nearly 3 grams. If it was brass, then depending on the mix it would likely be 40-45% of 3 grams. That's still 1.3grams ish.

Bullion value is based on the spot price of the precious metal content, i.e. its intrinsic value. e.g. a sovereign contains 0.2354 troy ounces of gold, so the current (variable) spot price for an ounce of gold multplied by 0.2354 will give you the value of gold in the coin.

What is the weight, diameter and thickness?

And one for @Peter Edge: "GOD SAVE THE KING AND CONSTITUTION X X" I'll see if I can take clearer pics Edit - better pics (hopefully)

Don't know. It is too early for IOM issues. The 1665 pattern farthing was only struck in London as far as I am aware. Presumably a modern concoction.