^ I would put Indestro's products from the period between 1960 and 1980 up against any Snap-on any day of the week and twice on Sundays. No question.
There are all kinds of articles on Wikipedia about "Confirmational Bias" (
https://en.wikipedia.org/wiki/Confirmation_bias) and other traits we have as humans that cause us to convince ourselves that we made the right purchasing choices. Nobody wants to believe they made a mistake, or paid too much, or bought an inferior product.
Ergo: because you drive a Pontiac, Pontiac is the best car that Detroit ever created. Same with Snap-on tools, or Wonder Bread, or Kellogg's Corn Flakes. We ALL do it - don't ******** yourself.
The reason I put that time frame up there is twofold: I don't USE any of my vintage stuff - it's all "collector" stuff. We started selling Indestro in 1970, and we instructed our employees to replace ANY Indestro item a customer returned - no questions asked. Rarely did we see anything that was more than a few years old, but that was primarily because Indestro had poor market penetration here in the Pacific Northwest.
I am therefore not really qualified to speak to Indestro's product quality in actual
use on the early stuff, although the early stuff that I do own most certainly appears to be top-shelf product. (And I own a LOT of it.)
In the late 1970s, with the flood of Asian imports hitting the American market, and consumers demanding "cheaper cheaper cheaper", Indestro got into financial problems and order fill rates dropped precipitously. The product was still top notch, but they couldn't fill orders.
In the early 1980's my brother-in-law pulled the plug and switched everything all over to Thorsen. (Thorsen went totally to **** right after that with their "TAT" line of imported product.)
Fortunately I wasn't selling Indestro when the "Duro-Indestro" branded product started going downhill. I do own
some "Duro-Indestro" (late production) product, and it's premium stuff, but I've seen examples that make me cringe:
Here's a late production "Duro Indestro" 41213 12mm x 13mm open-end and my 1970 41213 "Indestro" (which turned a LOT of nuts and bolts in the last 50 years) side by side:


In fairness, not
all of the "Duro-Indestro" product appears to be that crappy. If you peruse through this thread, you'll find photos of late-production "Duro-Indestro" sockets and ratchets I own which are the same top-shelf kind of product as the earlier production stuff.
Again, "best" is all subjective and is too often more a matter of personal opinion than reality. Most of the major players in the U.S. tool business in the 1950s, 1960s, and 1970s were cranking out top-notch stuff: S-K, Armstrong, Duro-Chrome, Indestro, Williams, Blackhawk, Proto, and Snap-On. Certainly there are some items the characteristics of which might feel better in hand - just as it is with women - but they all get the job done.