Proper selvedge jeans

^^^ Iron Heart chewed me up and spit me out, I'm sure they'll pass muster in the durability department - very good QC too, at least on the pair that I had and sold.
I had the 634.

I've got the 634. They kind of break you in, not the other way round. But after a while they really soften up nicely. I used to wear them and a Horsehide jacket on my motorbike, it felt like a suit of armour.