I just received an outboard fount in my mothers shed. On the top of the engine it says Thor, Cedarburg MFNG CO. I looked online and all of the Thors I see have a curved gas tank. This has a red cylinder gas tank. Where they ever made with this tank and what year is this Motor? Is it very valuable or should I keep deafening the fish and get dirty looks from fellow boaters (or vice versa)when I use this thing?