hi, no - sorry, I didn't measure it, it was "large", but the blade was bent, and I think any estimate I could now give would be quite wrong. Looking more closely at the pictures it looks to me as the part of the aircraft that may still be attached might have been re-buried:
almost looks like a...
Hiking on the island of Stromboli, Italy I came across the remnants of a 4-bladed propeller, and only found references to a crash of a plane using 3-bladed propellers: ASN Aircraft accident Savoia-Marchetti S.73 I-SUTO Stromboli Island
I am wondering what plane this propeller originally...