The black and red wheel is definitely an RH-5 (widowmaker). The wheel at the bottom of the sequence is an oddball- - - -it has a very narrow locking lip on the removable bead, with no extra lock ring, with a couple of milled-out spaces that won't be visible until the tire is deflated and the beads are hammered away from the flanges. To remove/install the ring, part of it must be pried over the lip of the main wheel and hammered sideways on and off. That style of lock ring was most commonly used on the 18" tube type wheels used on 1 ton vehicles. My 1959 Chevy 3800 had them installed and they're VERY susceptible to rust damage to the extremely narrow locking lips. 20" wheels with that type of lock ring are pretty safe, but ONLY if the locking grooves are rust-free and unworn.
Jerry
