I don't collect cast iron but love cooking with it.
I have a 10" single handle pot, 6" deep. The lid doubles as a griddle and is 1" deep. On the lid is a large star, centered in the star is a circle with a cross 9 (+), Inside the cross, both horizontal and vertical is '4 IN 1'. On the lid handle is the letter 'W'. The lid has a raised boss opposite the handle that indexes into a slit on the rim of the pot.
I was given this about 15 years ago and it had a thick layer of burned on crud that had to be scraped and wire-brushed.
Any idea as to maufacturer or age?