Nice -- looks like an Apache Eagle. We had one from circa 1969-1985, a 1968 model IIRC in dark green. My dad sold it without telling me, and I'm still mad about that! We loved that little trailer.
I'm guessing yours is a 1969-71 model. Earlier years might not have had that useful clamshell top. You know, of course, that the clamshell halves had bent wire hangers to suspend them from the bottoms of the extended bed frames, thereby creating off-the-ground shelving for gear. Well thought out design -- except for the awful leveling jacks. They jammed, bent, rusted, and were a general PITA to live with.