The Lancaster International Patent is a British-made plate camera from J. Lancaster & Son of Birmingham, a maker active in the late 19th and early Edwardian period. It is a wooden-bodied view/field camera designed for sheet-plate photography, aimed at amateur and travelling photographers of its era.

With only two recorded UK auction hammer results, the Lancaster International Patent has sold for £160 and £160 (rounded to two significant figures), giving a narrow spread around a £160 median at saleroom level. Today these wholesale hammer prices exclude buyer's premium, and what a Lancaster International Patent is worth in the current market depends heavily on completeness of the brass fittings, bellows condition, and whether original plate holders are present.