I own a Frederick Williams in 12 bore similar to your 16 in that it has a scalloped boxlock action. Geoffrey Boothroyd wrote an article on the gun in the millennium issue of the British Shooting Times and Country Magazine dated 23rd December 1999.According to Geoffrey ,Williams guns were exported to Japan through a Mr Horio in Kobe Japan and to A and W McCarthy in Dunedin New Zealand one of whose staff travelled to Birmingham to train with Williams.
David Baker in the March 2002 British Sporting Gun magazine in his Antique Answers column states that there is a listing for a Frederick Williams in the London directories at 3,Broad Street Station, Liverpool Street,EC in 1912 and 1913 and then at Bishopsgate,EC from 1914 to 1918. As both your gun and mine are engraved Birmingham and London this would probably date your shotgun and mine to between 1912 and 1918. David Baker also stated that in his book The Heyday of the Shotgun that most of the guns in the George catalogue that forms the appendix are probably Williams guns though the cheaper end of the Williams range.
Geoffrey Boothroyd quotes prices from what he estimates to be a 1930s catalogue from 7 up to 100 for a Superior Grade sidelock. The reprint catalogue which I own quotes the High grade sidelock ejector at 70 and a scalloped boxlock ejector with invisible bite at 32 unfortunately I dont know the published date of the catalogue but probably a bit before the 1930s catalogue referred to by Geoffrey Boothroyd
Last edited by Konor3inch; 01/29/19 02:38 PM. Reason: Clarification