Harnell Unlimited rod question ?

[UKChris1]

Some photos of my two Harnell Royal rods:
The first are of the labels on the Royal VII unlimited rod then a picture of the dark green I used to replace the mottled pale green original overwrap (as I couldn't get that colour).
Next is the Harnell Royal V 80lb label then the 80 and unlimited side-by-side. You can see just how much stouter the unlimited rod is.
Then a close-up of the tips, again showing how stout this rod is.
Finally a quick shot of my chair rod tips in their rack. The white blank to the left of the Harnell is a G. Loomis 130 that I'm going to build into a real monster-stopper. According to my old Harnell catalogue the unlimited blank weighs 24 1/2 oz as a bare blank. The Loomis weights 34 1/2 oz as a bare blank! Phew.       

[1badf350]

Just to bring this topic full circle. I recently got a rod just like John's. This one has the label on it.

[JasonGotaProblem]

If nothing else it's colorful

[oc1]

I always liked that color scheme better than the red and gold.

[JasonGotaProblem]

USF colors

[UKChris1]

The mottled light green was the colour of both my rods' overwraps but they needed replacing. I couldn't get that colour so went with dark green.

I had read in a couple of books a reference to Harnell rods being 'double built'. I never really understood what thet meant since they could not be double-built in the same way a split cane rod can be. However, I see that the label on your rod says 'DOUBLE BUILT by Harnell'. I guess that is the origin of the comment I'd read, but I still don't know what is meant by it.

Any clues anyone?