A Cleverly Disguised Knock-off?
As near as I can tell, this is not actually the official adaptation of the film 'Long John Silver' that came out the same year, but in fact a very similar looking knock-off. It does portray Long John Silver much the same as the movie. He has a crutch instead of a peg-leg, just like the film, and he bears a very strong resemblance to Robert Newton. The font used for the title bears a striking resemblance to the Disney film title as well.
It seems though that nearly everything about it was designed to 'fly beneath the radar' and to be just different enough to avoid a lawsuit if it were noticed. Long John Silver is, of course, a public domain character, and there's no notice or indication that it's a licensed Disney property, and almost all the Disney adaptations of the period were produced by Gold Key Comics, not Charleton. It seems to add to the subterfuge, Charleton had Long John Silver's trademark red coat appear green on the cover, though it is red everywhere within; and just to further confuse the matter, they chose to start publishing with issue #30 (and begin in the middle of a story) to make it seem as if the comic had been published for years; while not impossible, there is no indication that there was ever any produced before this one.
So how is the comic itself? It's O.K., but not particularly outstanding in either writing or art. The first story, 'Long John Silver Mutiny on the Hispanola tells the latter half of the 'Treasure Island' story in comic form with a different ending from the Disney movie - perhaps another attempt to duck copyright infringement suits. It's fine but not too exciting, and since it's for kids, Long John Silver seems to be even more toned down than in the Disney films, eschewing lethal force.
'Long John Silver Meets an Ally' is a bit of a misnomer, since the ally is Jim Hawkins, who he met a long time ago at the point of this story which takes place after the events in 'Treasure Island', and just creates an excuse for Silver and Hawkins to do more adventuring together. It is, however one of the better stories in the book.
"The Pirate Sweeper." is a text only story (included as customary in comics of the time) that is actually a pretty good story about a pirate hunter working for the English crown - though Long John Silver appears nowhere in it.
'Long John Silver and the Raid' is probably the best of the comic stories, but it transforms Silver from a pirate proper, into a privateer for England. Still, it has some great intrigue.
'The Happy Castaways' has no pirates in it at all, though it has an island and some nautical moments. It's a good enough story, but my guess is it's a reprint thrown in to bolster the length.
There's also a one-page that includes some unrelated 'weird facts' the main one being about the Mary Celeste (a so-called 'ghost ship'), so it kind of fits with the theme, but also looks like a reprint thrown in for page count.
All-in-all, even though it's not an official licensed product, it's not bad if you need a Silver Age (pardon the pun) pirate comic fix, but it's in no way a must read, and the tinkering with the character to 'soften' of Long John when it comes to violence (comics are for kids, dontchaknow) is a bit disheartening.