Dating a mercury outboard
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(Overhead valves or OHV is a misnomer, best term is "valve-in-head".) Site reader Buddy Ault kindly submitted this photo of his grandfather E. Snodgrass on what looks like an Indian "Camelback" (gasoline tank over rear fender) doing some "off roading". I think that model of Indian came out in 1906 and it looks new here, and Buddy does know the shot was taken no later than 1910.
The Trev Deeley museum in Vancouver BC Canada kindly emailed me and said they also thought it was a 1906 as they have one on display.
The Camelback was advanced in that the engine also served as the seat post (instead of a frame tube there, to save weight) and because it was an F head (inlet over exhaust valving).
Sort of ironic that their first mass produced model was more advanced in that regard than their last Chiefs which were just L (flat) heads.
Those very early Indians only produced a bit over two (2) horsepower.
Next is a photo kindly submitted by Ed Gregory of his grandfather also on a 1906 Camelback, at Wincester NH. Not sure of the Indian model, looks like a Camelback engine but the fuel tank is in the traditional position and not over the rear fender, so perhaps a successor to the Camelback.