BSA Model K family outing

Here's a BSA Model K 550cc side valve combination doing exactly what is was deisgned for - providing dependable family transport. Not 100% sure of the year of the bike, hard to say but it looks like a chain drive bike - chain drive was introduced on the K in 1914 and ran concurrently with belt drive as an option for several years. Most likely this bike is early post-WW1. It's nicely accessorised with a lighting set and klaxon atop the petrol tank.

BSA Model K combination.