It's not shown very often because it's been banned several times in many different places. I saw it in NY years ago at a Warner Bros. cartoon festival.

The amazing thing about Popeye is that, even though Segar was perfectly happy (and planning) to do away with his character after the Dice Island storyline, when he was brought back he so quickly took over the strip. I think it was only a couple storylines before Ham Gravy was gone, never to be seen again except for a quick background appearance, and only a year and a half or so before Castor was also pushed out. I really love the job Fantagraphics has been doing with their Popeye books.