Remington model 1900. 16 gauge, serial 3864XX. Barrel marks under the forearm are XKE B4. Forearm iron and wood are both marked 3864XX Barrel hinge lug is marked 285 and 288. Water table on receiver has 3864XX on one side and 705 under the patent date of Oct 30th 1894 on the other side. In the lower part of the receiver were the barrel hinge lug goes it is marked 2007 J. Barrel blueing has turned to a brown patina, bores are excellent, case colors have darkend. There is no rust on this gun. Wood shows no marks, scratches or dings and would be excellent but the stock does have a inch long crack behind the receiver. Original Remington butt plate. Remingtons page tells me that the K stands for steel barrels and the E stands for ejectors. Can anyone tell me what the X ,B4 and the other numbers mean? Is this a later model 1900? What would the value be? Thanks for any help!!