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Lady police officers in the 1920s

I’m a volunteer at the Lock Up, Steelhouse Lane, Birmingham (www.wmpeelers.com). The plan is to turn this interesting building into the West Midlands Police Museum and to this end we are holding open days and events to raise funds.

While at Steelhouse Street I found the attached photograph of two women police officers on a motorcycle and sidecar. I guess it dates from the 1920s as there were no women police officers until after the First World War.

Can you identify the make of motorcycle and its year please?

Richard Gill, email.

It is an appealing idea to turn the Steelhouse Street Lock Up into a police museum. Recently the police station in a town where I used to live was converted into a home, with the cells now bedrooms. Offered for sale, I was tempted, until I realised there was no decent workshop attached!

The machine is a Sunbeam, built in Wolverhampton by John Marston Ltd of Sunbeamland. I can’t see enough detail clearly to confirm the precise model but it would appear to date from pre-1922 due to the front brake stirrup design, which was found only on the leaf spring front fork type fitted to some Sunbeams of the period.

The registration mark FX 2733 was issued in Dorset in the period 1904-23 and its four digit number is