gfretwell, you're pretty close.
I had some in the basement from Dad's supplies.
It was virtually identical to the construction of UF, but it was a little more flexible, and had the uniform tan MN color we've come to know and love.
ETA: I remember finding lead jacketed wire serving my old outside porch light that dated back to the 1930's...
<minor hijack> anybody think the industry will standardize on the jacket color codes that are being sold by various makers?
IIRC, orange = 12 AWG, Yellow = 14 AWG ? <hijack>
[This message has been edited by DougW (edited 06-25-2005).]