Did a similar copper half sol also exist?

I have a coin weighing 3.5g, with a diameter of 20mm, and the obverse is identical to the full sol but of course the weight and diameter are too low to be a full sol. There is no detail on the reverse, any ideas?

Pictures? Probably on of the other higher denominations.

Now I look, the crown looks crude in comparison. Maybe a forgery?

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It looks indeed quite wonky.

3.5 grams of cooper would make it close enough to 1 liard. ¼ sol.

Are you sure about the year? Not a lot left on the coin.

1/8 sol and ½ liard used similar coat of arms design around 1775-1789, but they are lighter than 3.5 and Krauze catalogue does not have 1 liard of same design. Half sol is equal to two liard and Krauze calls them 2 liard.