MILAN, June 19 (Reuters) - Leonardo Maria Del Vecchio on Friday blamed Delfin's board for a stall in negotiations with banks over financing that would have enabled him to become the largest investor in the family holding company.

Delfin is the top shareholder in Franco-Italian eyewear group EssilorLuxottica.

Del Vecchio, 31, had offered to buy out the stakes of two siblings and fellow Delfin shareholders in a 10-billion-euro deal, a move that would have lifted his holding to 37.5%.

The heir of the late EssilorLuxottica founder, Leonardo Del Vecchio, said lenders had recently asked for additional guarantees and were "pressing for a greater commitment from Delfin", but the board was divided.

He made his comments in a letter to the website of online newspaper Quotidiano Nazionale, which he owns.

"At the next Delfin shareholders' meeting on June 30... I want to understand why the board's caution has emerged" he added.

Delfin's board is chaired by EssilorLuxottica CEO Francesco Milleri.

(Reporting by Elisa Anzolin)

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