This one is bugging me. It appears to be KM 504, but the weight is wrong.
KM 502 (10 soldi): 2.48g (21-22mm diameter)
KM 504 (15 soldi): 3.72g (24-25mm diameter)
My coin: 3.2g (24-25mm diameter)
Given the crudeness of the manufacture, I have no idea how much variance there could have been.
Also, Krause lists but does not price the coin, leaving me without a pricing reference.
The second 2 in the date also appears to be repunched.
