Very Kool! Unit 3950, now we know: the origin/inspiration of AMTs W925 box art in 1971, surely AMT best truck/tractor boxart ever,( so good it lasted until the late 80s under ERTL). AMTs artist was also surely inspired by this, for the Fruehauf trailer box art too.
Both kits seem very nice, for their time, boxes look great (corners, no fading or mildew + every parts still sealed) yours looks like late 60s early 70s OTAKI very first editions, final Prices can be tricky especially on eBay: way over top OR...pretty average, depending who's fighting with you & as mention when! Rarety of those in original OTAKI boxes is true, BUT important to remember that most of the 1/16 OTAKI cars kit molds are still with us, including the MIURA & AR33. FUJIMI now owns,( since the late 80s), most molds of OTAKI former 1/16 car kit line
Nice work! reminds me of 1982, when I got the same kit.... Indeed, Revell (truck of the world series). Italeri & Matchbox; F12s (&Globetrotters) are 3 totally different molds, all introduced back in 1981/82.