keep in mind it's an 18, not a 22.
jumbo joes all had that rib didn't they?
also, i have a smokey joe that has the rib as well.
if it was a 22 with the rib, i'd say it's a sears or a happy cooker or something.
but it's an 18.
there are a few oddities though.
the unbranded vent on the lid...