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E, DanielI'm always struck when a cetain pefect storm of condition occurs, often heavy wear to edges and a chunk or two missing - combined with a stunning crystal clear image. It really is a blazer to my eyes, and the wear simply conveys the times and travels its seen. Kind of a steinbeckian hit the road card 
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Unlike Leon I think a slab - especially SGC's - would be perfect for your piece. Not so much for value (though I think it would add 30% to its value) but for the beautiful archival appearance it would give it. Placing an item with wear such as this under a really classy frame always focusses the eye on its true merits and I feel creates a museum appearance and style.... Also handling becomes much nicer for me, though I know others prefer sans holder.
Daniel,