These appear to be exactly what CLC sells (except they sell with macon blades). I row with the same oars (including macon blades). The size is just right with the Piantedosi rowing rig. These oars weigh about 2# each so they are really easy to handle. Can't speak to the hatchet blades as I have never rowed with them.
If you look thru the picture gallery for the MC 16.5 in the CLC on-line catelog, you will find several pictures of my boat.