Epic head trip by Todd, who painted several other scenes involving mariners and mythical beasts, according to Last Gasp’s Ron Turner. The ad is probably from a Krupp Mail Order Catalog.
The giant poster (20″ x 26″) was on sale fairly recently at Last Gasp Publishing, although it’s out of stock now.
(Images by appleclub and jl.incrowd)
2 Warps to Neptune 
I was the owner of Bagginer Press and the publisher of the posters above.
In loving memory of Larry, Todd, Vaughn Bode, and Steve Hickman.