Did I Finally Find Doubling On This 1953 Lincoln Wheat Penny?

All the thing that are getting your attention are from the same issue. An aging die. Die wear towards the rims of the devices is common on an aging die. (just like wrinkles are to a senior person.) The die chips are also from the die breaking away and again showing it age. (Basically like scars to the die, creating events that will be with the die until it is retired) these are common on the 1950's wheat cents as they way over used the dies so much, that all kinds of die events were happening. While they are interesting to a new collector, to a seasoned collector, they are common events. The die chips are like chocolate chips on a cookie. Look very interesting, but while being eaten, they are harder to be noticed.

I may have fibbed a lil, he got this one at a coin show, where if you buy so many coins, they'd give you a free coin. He thinks that's where he got it and on the lil protector it said "error double 3". But after researching Weller and copper coppercoins I couldn't find that variation on either site, so I figured it was Machine Doubling or some other die issue

That is the same doubling as when you hear about a "poor man's doubled die." Not actual doubling: Just looks like an extra number at the end.