I would definitely cut them myself, and would not want to trust this part to anyone else. I personally prefer an LOA vs. slabbing the signatures.... I like to mat and frame them with a nice vintage photo (will try to post images of a few later...)
But if you are dead-set on slabbing them, I recommend either Spence or PSA. Both are equally respected/recognized, and both seem to command the same money in the marketplace. I guess it just depends on who you think has the more attractive slab (and whether you prefer red or blue...)
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