Sorry, but Trinary and Bookend monikers are typical dog-whistles used on ebay to attract buyers to notes with nothing going for them. As others have mentioned, your $50 is a nothingburger. Click on this link to a website with examples of fancy serial numbers- http://coolserialnumbers.com/FancyS...Numbers.aspx
The note is not a repeater and the note is not a true bookend note. I read the OP mention Trinary. The term Trinary means absolutely nothing except on Planet ebay, where the sellers make up their own auction descriptions. No real professional auction house uses that term. None of them. Not Heritage. Not Stacks-Bowers. Not Spinks, none of them.
If you like it, keep it, but personally, I see no premium over face value.
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