Thanks guys, some good answers. I did wonder myself whether it could belong to some sort of vehicle maybe for logging times. It is all mechanical with a platform escapement and it is ticking along well. It has a date window which i forgot to mention that goes with the small rotatable month disk that has to be altered manually by hand unless there are parts missing, im not sure. It is marked with Made in Britian and a little starburst type logo along with two arrows however they are not the military crows foot type.