Hey Mike, I think you're thinking of the Heiland stamped letters, which is a "close" cousin to the MPP tube and what most people use because the MPP is very hard to find and Not cheap... the MPP has no stamped lettering, only markings were the "MicroFlash" plate logo has been removed.
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I have a really good reproduction that I can get my hands on and take some pics, done by Park Sabers I think.