Terry,
Your gun is built on the Wards target gun action, featuring Rylands patents #119,493 registered in 1917 and/or #122796 registered in 1918.The fences of these guns are a distinctive feature. The main springs in the action are coil.Charles Ryland did at one time work for Charles Osborne hence the business connection.
Some Target guns sold by Wards are also engraved with Wards trade mark usually found on the action flats, which as the name suggests features a roundel target.
A year or so ago I had the opportunity to inspect a mint version of your gun also a 16,G bearing the name Charles Osborne.
For more information on the Ward /Ryland gun see The ;British Shotgun Volume 3 By Baker and Crudgington, pages 180-181 and Shotguns and Gunsmiths by Boothroyd pages 46-49.
J.D.Dougall also made a pigeon gun with a trigger plate action that featured fences similar to those seen on the Ward[See British Shotgun Vol;2,page16
Nice gun!
