I recently obtained a silver half hunter pocket watch and am trying to find out some info about it. From the hall marks I have found that the case was imported into London, the mechanism is Swiss made, the case is imported silver and brought into the UK in 1919 by George Stockwell. That is where my information ends. The "maker's" mark is what appears to be a man holding a watch riding on an airplane type contraption being pulled by three horses....? There is a serial number of 20508 with a J underneath. Do you know who the maker could be? Thank you for any assistance.