1984 Murry Baja with some upgrades like aluminum wheels and stand, 21 speeds with Shimano cassette and rear derailleur . Falcon (I know ) front derailleur.
197? Ross Professional , got it at auction with 7 other bikes for $250. unfortunately 2 hidden from the pictures were kids bikes I tossed
198? Schwinn World Sport Mixte came with the Ross
198? Schwinn World Sport for $10 at Estate sale
1970 Hiawatha 5 speed that looks like it was never used. $10

Late 60s Western Flyer single speed from dumpster behind LBS

Also have a bunch of English 3 Speeds from the 1940s and 50s but don't consider them low end