Most obscure player jersey you've ever owned...

[Benson]

I can't ever recall having any replica baseball jerseys, but someone did say Joe McEwing.
Autographed Royals Game Used

Other than minor league jerseys my most obscure ML game used would probably be Ed Rogers of the Orioles (30 career games, 6 hits)

I do own two Mahmoud Abdul-Rauf NBA replicas on the Nuggets and Kings.

 

[MrMet]

Imma be honest here, I'd love to have a Joe McEwing Mets signed gamer