Here are two wrenches similar to the original held by the Bahco inventor in his photo.
The larger wrench is 16 1/2 inches long. It has the following markings: "Eck-"Schwede" on the upper jaw; a stamped "H" at the base of the upper jaw; stamped "CHROM-MOLYBDAM" farther down; 1 1/2 on the handle; and "Dako" in script, to the right of the size stamp, also on the handle.
The smaller wrench is 12 1/4 inches long. It has the following markings: a "1" stamped on the handle; a stamp showing a bell symbol, with crossed hammers above "R H & C" inscribed within the bell.
Neither wrench has "Bahco" anywhere on it. Imitation is the sincerest form of flattery, which doesn't excuse patent infringement. Are these wrench Bahco-produced for other manufacturers, or did Bahco license DAKO and R H & C to use its technology? Who knows?