) But the later normal 1917 to 1922 windshield hinges could easily have been bolted onto the early style windshield or vice versa (see the later style (wrong ones for my car) on my 1915 cut at:
action=view_profile&profile=hap_tucker-users the interchange fine. Compare page 256 and 262 of Bruce Mc Calleys book Model T Ford. It also has the 1917 model year to mid 1920s style fenders with the curved front fenders and the crown on the rear fenders rather than flat. Assuming that both the fenders and the windshield hinge were original to the car, those two items would date the car between Aug 1918 and Apr or so 1919.
Adrian thank you for posting the link they have some great high resolution photos that give a lot of details. Bottom line up front: I think the car was a 1917 model year produced around Mar Apr 1917. If they are 30 x 3 1/2 on all wheels it might be a Canadian roadster or someone may have changed it out so they only had to carry one size spare tire (not a spare tire and wheel like today but just the rubber part that would be used to fix the flat if needed). Model T parts are very interchangeable, for example the windshield hinge it is clearly the style used 1915 to early 1917 that has the equal length arms (ref: the Apr 19, 1919 entry on windshield hinges.
Question: Are the front tires 30 x 3 or 30 x 3 1/2?