length: 23"
blade: 17 1/2"
blade width: 1 1/8" (above ricasso)
grip and pommel: 5 1/2"
guard: 12 1/4"
weight (dagger): 1 lb 13.7 oz
weight (dagger and sheath): 2 lb 3.0 oz

From my Samples, Singulars, and Somethings Completely Different collection -

"Single edged sail guard main gauche" - yeah, it's a long title, but you have to admit it's descriptive. The sail guard style main gauche is Spanish, sometimes called a "viscaine" dagger, and has it's origins from the Basque area of Biscay. This particular main gauche has a single edged blade. (And a sail guard. And it's a main gauche.)