Getting sets of older wrenches like that is RARE. Usually you have to get them one or two at a time here and there, and maybe you never get a full set (I spend a couple of YEARS working on my Proto sets of combos piece by piece, and I only have one FULL set, the second set is missing the 1/4, 3/8, 7/8, and 15/16ths to be complete to 1-1/16. (three more if I want it to go to 1-1/4 like the first complete 18 pc set...)
But I have six 9/16ths!

(and a bunch of other dupes.)
Nice score! and yes, you DO ****!