Identical in configuration to Model 40, except furnished with an aluminum alloy frame. Discontinued in 1974. Editors Note: First 37 pre-Model 42s were manufactured with aluminum alloy cylinders. Weight 11.1/4 oz., compared to 13 oz. for standard model. Balance of Model 42 production was with steel cylinders. Add 300% for extremely rare aluminum alloy cylinder variation. Circa 1952-1974. Model 42-1 reintroduced in 2009.