Hi: I read the post, it is very interesting. It is also one of my favorite lamps. I've had three. One is the gave my brother. I have another from Canada (the seller said that belonged to rail way). I must rescue. It is the most faithful to the Bicknell Patent: "My invention relates to certain improvements in dark-lanterns for the use of policemen, watchmen, and others. It is an improvement on that general form of lantern which is constructed with a rounded front side and a fiat or slightly-concave rear side adapted to lie against the wearer, and in which the front portion is hinged to a back plate attached to the waist-belt, so that the front portion may fold outwardly with the lamp to give access to the latter.” By the way, from an article by unknown author: An oil lamp for police duty, known as "The Crescent Lamp" was patented by Captain Bicknell, and was reported to be in use all over England and in the colonies. In 1894, he stated that 10,000 lamps were in use, and it was said that they had nearly superseded all others. In July, 1890, the Chief Constable of Edinburgh wrote to Captain Bicknell with a view to using the Crescent Lamp in conjunction with a liquid heater which he had invented. Captain Bicknell would not agree to this and said. "I wish you every success, but do not think that the men in this country will be allowed to boil coffee on their beats."