From looking at the pictures in The Standard Catalog, the second pic with the swept back rear fenders is 1912 or later, whereas the 1910 and 1911 cars had the more curved style. Assuming the date of 1910 is correct maybe the mystery car might be the prototype. They only made the one model (30hp - 110" wb) in 1910-11 and then three models for the final years - 1912-13. It would be interesting to see one in its original colours.