How do I I.D. Magneto Powered H/Lamp bulbs?

[barnstuf]

I just uncovered a small stash of headlamp bulbs by Tungsol, also some by Mazda National Lamp. The wrappings show first patented 1912 with subsequent patents to 1916. Have round base that would enter the socket and the base has two equally spaced prongs on the base side, and for contacts on the base bottom are two oval metal contacts. No markings on the bulbs at all but in shape and size resemble headlamp bulbs for a later Model T or Model A. Could these be bulbs for magneto power? Model T or other make car? I have no use for them but want an I.D. to facilitate selling them.

 

[redmodelt]

The prongs and contacts on the base sound correct but the rest of the bulb sounds wrong. This ad shows what a magneto bulb would look like.
http://www.ebay.com/itm/model-t-for...t=Vintage_Car_Truck_Parts_Accessories&vxp=mtr