That mark dates from the early 30's to the mid 50's. It's an Outer's pattern with a fish scaler back. The scales are pearl/cracked ice celluloid. Keep it in the open air, that celluloid gives off fumes that promote rust.
For the rust on the blade, coat it with Mineral oil, and see if you can rub it off with a soft cloth.
That brand is popular, I'd guess $50 - 75 if the rust comes up.