HB-15; Laminated stainless steel with a satin polish, as used on the Odel. It's about 3 1/2" long, 7/8" wide at the base, and .105" thick.
These are the excellent laminated steel blades from Helle. They have an outer layer of tough steel for durability, and a hard inner core (HRC 58-59) for superior edges. The stainless Helle blades have the Helle logo etched on the revere side of the blade.