A fantastic find! Apart from a lack of company lettering, the livery is Great Western Railway, so I would agree strongly with Daniel about it being a generic version for the UK market. I know that Bing trademark is post WW1, but if anyone could pin down the date, I'd love to know. I know it was used on the earliest Bing table railway items from 1922, and I've also read elsewhere that it was introduced circa 1919, but sometimes a little mystery is all part of the allure of train collecting.
Mark