[The Australian Panther]

Seems to be all about pretentiousness. There's no credits or date of publication.
Has to be American, because the policeman speaks like an American. So probably mocking pretension that may have been a fad in say, New York at the time among the idle rich. Doesn't translate very well into today's humor.
Pretentious upper class Englishmen used to speak with a french accent at one time, so maybe pretentious upper class American's pretended to speak like upper class Englishmen.
If you speak the dialogue aloud, slow it down and exaggerate it, its quite amusing.
Lisping? Here is Peter Cook, who used to use this upper class twit voice a lot, in the classic 'Marrwidge' scene from 'The Princess Bride' .
Cook would have loved this cartoon.
https://www.youtube.com/watch?v=_bY0fdgpISc
Bah Jove!

Link to the book: Dippy Dudes

[Robb_K]

Seems to be all about pretentiousness. There's no credits or date of publication. <br />
Has to be American, because the policeman speaks like an American. So probably mocking pretension that may have been a fad in say, New York at the time among the idle rich. Doesn't translate very well into today's humor. <br />
Pretentious upper class Englishmen used to speak with a french accent at one time, so maybe pretentious upper class American's pretended to speak like upper class Englishmen. <br />
If you speak the dialogue aloud, slow it down and exaggerate it, its quite amusing. <br />
Lisping? Here is Peter Cook, who used to use this upper class twit voice a lot, in the classic 'Marrwidge' scene from 'The Princess Bride' .<br />
Cook would have loved this cartoon. <br />
https://www.youtube.com/watch?v=_bY0fdgpISc<br />
Bah Jove!

Link to the book: Dippy Dudes

Exactly THIS!  Not just in New York, but all over USA and Canada.  The nouveau riche and pretentious high society wannabees would feign  an upper class English accent.  That lasted through the 1940s, and vestiges of it trickled into the 1950s, and even early 1960s.