Thanks! It was a job for four mens with four metal detectors (my old F-75, Minelab Explorer II, X-Terra T-74 and russian AKA Signum 7272).
It was difficult. This coins is very small. Weight of a coin is about 0,7 g (0,025 oz) and diameter is less then half inch.
But this coins is very low price. About 1-2$ for one coin.