Snagged this No. 19 Indestro Socket Set at the flea this morning. Fairly complete, though mixed vintage sockets, some with the stars, some without.
These are hard to search for on the thread, so if you have one, and it's already been posted, my apologies in advance for neglecting to give you credit, and please let me know the post numbers.
The example on AA only has the marking on the Ell handle. My example has that marking, but also boasts the early ascending letters logo on the carrier, which was patented in 1926.
It's a stylish, handsome carrier. The two hinged ends release the Ell handle, which allows that retainer to be flipped up, releasing the sockets. AA compares it to a steaming locomotive, it does have those lines, and the railroading allusion is probably more apt, but something about it makes me think of Jules Verne, "Twenty-thousand Leagues Under the Sea."