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Dan Mathewson...will grade Helmar T332 Stamps, they also grade the 1950 R423's which are tiny, stamp-like little strip thingys (strip cards? not sure...they have the perforated/jagged stamp-like edges...so, I'll call them thingys). Anyway, I have both of those in holders right now, orange and purple backs, so I know they grade 'em.
-dan