The majority of teams didn’t have a logo at that time. I think only the Colts, Eagles, Rams, Cardinals, Cowboys (then one year old), and Redskins had helmet logos then.

Every team complied, except Cleveland, although they had numbers on the helmet for a few years in the 1950s. Finally, in 1964, the league designed a logo for them; an interlocking CB. The Browns put the logos on the helmets before the first exhibition game, but the players stripped them off before running onto the field. And their helmets have remained unadorned ever since.

Red Right 88

Any team that includes an ape or monkey is just asking for it, so I'd assume this is tongue-in-cheek.

Call me clueless, but what is this?

which pretty much describes the Browns' history over the last half century.

More room for decorative "doggiebone" treat stickers for helmet rewards of player accomplishments (like Buckeye leaves?).

but I am sure it won't involve any sort of imagery similar to this:

I’m no longer a Browns fan.

I can think of a perfect one.