Nice SCOPE scope!
Before yours, I thought Royal Astro contracted for the multi-colored eyepiece caps -- as with my 1964 Sears 6336, or the much-sought-after Sears 6345 with its color-coded slots in the RAO version of the Unihex.
The 6344s were SYW and had five color-coded eyepieces- 22mm, 12.5mm, 9mm, 6mm, and 4mm. My gold 50mm x 600mm Sears Tower by Towa has two- 20mm and 8mm. My Tower also has the exact same diagonal as Robert's, but my 6344 has a round-back diagonal. I think the color-coded eyepieces must have been a Sears spec thing along with the nice plastic eyepiece cans for all their models for a while, regardless of who made them.
Robert's colored EPs are the three part type it appears, with a barrel, optics assembly, and retaining cap - only the latter is colored in these. I want one of those 20mm yellow Kellners! This is just a great find. It's so 60s.