I went by Bill Knight Flooring in Winnipeg and asked a very helpful guy there called Doug Ross about "battleship linoleum" and he said there was indeed "Marmoleum" that filled the bill, and showed me sample pieces in grey and brown - which he let me get away with.
The material is made by Forbo linoleum Inc., in their "Walton" line, the brown is #167, the grey is #173. He said it comes in 6-foot wide rolls, and any length can be ordered, with next-day delivery from the distributor in Wpg. He said while the "battleship" is chiefly a commercial line they are trying to move it to the domestic market, so it is readily available. Price runs about $4.00 a square foot.
Here is the maker's site:
www.themarmoleumstore.com
See also
www.ForboLinoleumNA.com
I'll post pics of the samples later.