The small-diameter Prince wheels introduced in 1927 used 25x3.30 tyres. For 1925 the Prince had a wedge tank, for 26 and 27 the tank was made to fit between the tubes of a frame like yours, and for the last year 1928 it had a more curvaceous tank to match the Indian Scout 101 styling. The only year of small wheels and a frame like yours was 1927.
Not common, but it should be possible to find the missing bits.
Leon
Edit: From the tank shape, the Prince in R's link above is 1926-7, rather than 1925 as it is labelled.