Three prong center

Made in Italy
Matrix / Runout: AA 421 861.1 E (Label side A)
Matrix / Runout: AA 421 861.2 E (Label side B)
Matrix / Runout: AA 421861.1E=1/520 (Runout side A)
Matrix / Runout: AA 421861.2E=1/520 (Runout side B)
Rights Society: BIEM