If they're Crane, they'll have CRANE cast right into them somewhere. Crane, Isky and Erson all three made almost identical rocker setups. Plus, there's the possibility they are modified factory 273 rockers. It really doesn't matter as any of the four are all about equally good. This is what a Crane rocker will look like.
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The Isky rockers have a machined pad on them like this...and say ISKY.
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The ones in post #3 look like Erson rockers to me. That appears to be the old Erson logo. Crane ductile rockers are plain on top and have CRANE cast into the bottom.