It's ways of marketing common date lower grade Morgans. Large marketing outfits like GovMint or TV shows like RCTV buy the coins in bulk in lower Uncirculated grades and work out deals with TPG's to have them slabbed with special labels. The coins are being encapsulated, not graded.
In the old days Brilliant Uncirculated was around a MS63 and then you had grades like Choice Brilliant Uncirculated which were closer to 64-65. Nowadays the terms are just used for marketing and no longer have much of an association with a particular grade; "Brilliant Uncirculated" could be anywhere from MS60 to MS65.
A lot of those labels are marketing as others stated. However some are from specific collector or places like Gene L Henry, Binion Casino, Fitzgerald Casino, New York Bank Hoard, Great Montana Collection, etc.
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