The FN Browning Trombone is a pump-action take down rifle designed by John Moses Browning in 1919, patented on 1 August 1922 and manufactured by Fabrique Nationale d'Herstal in Belgium between 1922 to 1974. About 150,000 were made. It is also know that serial numbers had no "product code" {W} prior to 1969. * There are no known serial number records for the earlier produced rifles * Location of your guns serial number... I'm not sure. (under the wood furniture maybe) However, once you do find it: Post 1958...use the Proof House link below: Post 1958 Manufacture date formula: http://proofhouse.com/browning/58_dating_sys.htm
