Wow, check out the paint job on that SP-600. Nice work Will. Hammarlund should have done it that way. And I should have kept the one I had years ago. I would have painted mine that way.
And my DX-100 (given to me by John K2ZA) has similar vernier reduction drives.
I run into Will KF4FZE fairly often on 40 meters. He and I were in the same (very cool) part of the U.S. Army (in different times). Will is retired but he still works at Ft. Bragg.
I heard Will on 40 SSB yesterday afternoon. I was listening with my HRO dial receiver (that I am now working on). I shot quick video:
Will was on a Swan Cygnet 270 that he had recently picked up on e-bay.
More on Will KF4IZE here: https://www.qrz.com/lookup/d/kf4ize