SWIFT 10HP (Type 5P) First registered 2 March 1931, VC7251. A Colliers' demonstration model in Gotrel ownership since 1935.

Inner bezels are reflective, tinned?
The original lens is said to include a YELLOW triangle and the SWIFT logo.
Possibly, done in fretwork or leaded-glass window style.
If any one has an original lens of this patented Rotax design, please contact swift@gotrel.com
The design is described in 'Cycle Car', 1930
and the lens replicated -  R.Lamp Lens.html