Numista has KM# 502.1 and KM# 502.2. I have this coin:
I think my coin is year 1711, but the size is 27.1 mm, weight 5.5 g. So which one this is? I'm pretty sure my coin is not fake, bought from Jean Elsen auction and I have made tests, it is definitely silver. I also have similar coin which is 30.0 mm. Both coins in Numista has diameter of 30 mm!
In 1711, the diameter of the coins was reduced but the weight was kept same.
The one with diameter 27.1 mm will be 502.2 whereas the one with 30mm will be 502.1
Here's a discussion on this topic on zeno https://www.zeno.ru/showphoto.php?photo=130648
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