Tom,
Interesting collection but not convinced these are proofs for the Sealtest/Lummis series...these could actually be a test for the company on the back. For that matter, they might be an issue that was going to be put out by that company but was never distributed. I am no engineer but electrotyping is metal imprinting and has nothing to do with picture printing if I recall. I have not done a search on the Rapid company yet but it might be worth doing. Just because something has the same size and a couple of same photos, does not mean it is Lummis...those photos were reused in several issues in and around that timeframe. Heck, I have seen that Seminick pic is several times. All that being said, it is cool stuff and certainly unique. You might want to throw this on the front page, people there would be interested and might help you with research.
Joshua
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