According to Savage & Stevens Arms, Collector's History by J Kimmel, your pistol was made in the first year of production - 1908-1909. Prices are strictly dependent on condition and any modifications that might have been made. Collectors would pay a premium for a first year production pistol. If your gun is in average condition without modifications. I guess that it would retail for at least $450 an asking price of up to $750 or more would not be unheard of.
FWIW the 2006 edition of The Blue Book of Gun Values shows a value of $550 for a model 1907 in 100% condition. But I believe this figure is not in line with the market. Plus this is a first year production gun which would certainly add a premium. Also there are tremendous premiums for grip types that can add up to $1,000 (yup, one thousand dollars) to the value of this pistol.