Armstrong 350/500
The Armstrong 500 was a solid heavy single, and I used one in the Gulf during Op Granby (Gulf War 1).
The panniers could hold a 20Ltr jerry can in eack one.
They are still in service today, albeit, badged as a Harley Davidson and now 350cc with the most welcome kick start.
Would make an excellent winter hack.
Regards
Geordie