Did they come from studios or industrial settings where a meter was not needed? It's odd, indeed. Regardless, these are good models because many (most?) of the selenium meters have failed and, as far as I have read, no manufacturer makes selenium material on the appropriate substrate any more = unrepairable. And a modern hand-held meter is more convenient.
Strange as they went out of vogue long ago (1980s?) as professional use. But it's curious that I notice quite a few E2's around.
Maybe making an alternate meter out of Silicon cells (no battery like the Sekonic Studio Deluxe) could be an interesting hobby project. For myself, I'd go unmetered. Or when I become rather affluent, try out a 2.8 FX-GX with modern TTL!
Congrats onyour Rollei! in my opinion the meterless E is the sweet spot, as it is as good as the F but does not command such insane prices. You will have fun with it I'm sure.
I've been seeing a listing on local classifields of an undescript Rollei for 290€ in tatty condition... Leather looks oily and smooth but not that much paint wear. Upon a closer look I was puzzled because it was unmetered, has a Planar 3.5 and interchangeable hood. Turns out it may be an F as per Rolleiclubs "can come metered or unmetered".
A bit of a risky buy (would need it shipped) as it could come with fungus, mechanical gumming or even an evil curse. Eager to negotiate, I sent the seller a lowball of 150 so let's see.
I liked a comment I saw on Youtube: Rolleis are not yours, you just take care of them for a while. As all the bidding I've done lately is only to raise prices and no wins, I've had fun reading about them.
Eg, it's incredible how still excellent a 1937 automat is. That thing could have seen a lot in its history.