The 442 is a 50 mm (2 in) double-edged straight carbide blade for Bahco Ergo scrapers. It's the blade that comes on the 650, and it also fits the heavy-duty 665.
With two cutting edges, it can be turned around when one wears.
Bahco traces back to 1886, when Johan Petter Johansson founded a mechanical workshop in Enköping, Sweden. He invented the modern pipe wrench in 1888 and patented the adjustable wrench in 1891. The Bahco name comes from B.A. Hjorth & Co., the firm that sold his tools, and the brand is now part of Snap-on.