The military nomenclature is meaningless unless you are a military equipment collector. All branches of the government gave a camera an identification number according to the type of photography the camera was set up for. A camera for portrait work would have a number while the same make and model camera with a different focal length lens for say landscape work had a totally different number.
The value will depend on condition, lens included, and accessories such as film holders or extra lens boards.
+1 to post #2. Check that the movements are smooth and the wood base and standards are in good condition, screws not missing, no stripped screw holes, no cracks in the wood, no pieces missing out of the wood. Minor nicks and scrapes are common and unimportant unless an excessive amount exists. The Ground glass should be present and not cracked. The back springs should have 7 to 15 pounds of pull to open sufficiently to insert/remove a film holder.