I believe on the v7III they call for the first service at 900 miles in the manual. Maybe someone else will confirm or correct.
Yes, I can confirm that the first service is 900 miles and NOT 600. I contacted Moto Guzzi directly and they gave me written confirmation of the manual which stipulates 900 miles. It seems that some dealers are either confusing the first service mileage with many of the Japanese bikes or are engaged in dubious practices!