A Storied Past, I'm Sure
I was able to use a minimum of bondo to hide the repairs of the ding on the top, found couple spots on the left side where previous bondo needed a touch up, but sanding the side brought out this nice lettering in green. Looks like it was a bright blue metallic with silver side panels and lettering on this "standard" tank. Tank is a 76 or 77 with a cap key code 3290.
I've put enough work in it now to want to do it proper so farm tractor red is out.
In the running:
I'm favoring the turquoise.