Mervyn - i will post photos of my collection a few at a time. Your badge is an Inspectors cap badge and looks to be in very nice condition. They were manufactured in the UK and locally in Shanghai. UK ones usually have a hallmark and most of the local ones have a Chinese makers mark - usually HC - but some were unmarked. My SMP collection is relatively small. I have one helmet plate, four different cap badges, one collar badge, one shoulder title, numerous buttons, three different silver spoons, a pair of cufflinks, long service medals and a magnificent cigarette box presented to a retiree with the cap badge set in the lid. I also have two early Tientsin British Municipal Police cap badges - which I hae attached a photo of.
The medal collecting scene is quite active in Hong Kong but there are not many badge collectors.
If anyone does need any information on Shanghai or other Treaty Ports units please let me know and I will see what I can do.
Shanghai Girl
By the way - the Shanghai River Police badge that sold on Ebay was expensive because it came with the very rare shoulder title which pushed the price up. Also there were two well known collectors fighting over it ! I was not one of them - I don't get involved in bidding wars ! Hee Hee