A lightbulb from 1909-1915 in perfect working condition is certainly worth something. How much, you ask? Well, I'd need to see a picture of it to be sure... But by the sounds of it, it seems to be a common cage filament Mazda bulb from the 1910's, so if that's the case it may be worth around $15 in perfect working condition (usually $10-$20). Selling this kind of bulb for more than $20 is very hard, but not impossible...
Regards
-Yoshi