dose anyone know

[Fulvio]

I have seen an NGC double presentation slab

http://samplecoinslabs.com/index.html/20...from-pcgs/

I wouldn't do it. Keeping them separate gives you more options, and maximises value. And anyway, slabs are already hard enough to store without making it worse. If you really want to present them together, there should be double slab holders available, or you could make one.

Heck, I doubt its even worth spending the money to get them slabbed at all, but opinions differ on that.