/A on the KT engine wouldn't be 1925 ??
Was there any difference over the years ?
No front brake in 1923 was normal.
A few years later would be a bit of a sales non-feature ?
Woops, overlapped.
/A is 1925.
No front brake on any Invincible, I believe. The front fork is a local copy of the c1920 Excelsior/Henderson, and not well suited to brakes. (I'm wary on being definitive about Invincible JAPs, since the last ones were assembled from parts - despite most of the parts being built c1923, the last new Invincible was advertised in Jan 1930!)
With no front brakes, the later ones had a better rear brake, with both internal shoes and a contracting band. Very modern - just like an Indian in 1911!
Changes were small over the years: on this one you can see "late" features like the different drip feed and mechanical oil pump on the magneto drive. In 1925 it would have had an alloy primary case, instead of the pressed steel on the original, but this seems to be missing. Some of the very late ones used well-based rims and wired-on tyres, instead of the 28x3 BE on this one.
Leon