1990 Sliver T-Shirt

[Sickboy]

hm, I am now in contact with somebody who wants to buy my 1992 longsleeve as well, its this:
http://www.ebay.de/itm/Nirvana-Longsleeve-schwarz-XL-/201531063819?hash=item2eec2ffe0b:g:JAUAAOSwx-9W0dDt
From what I see for the T-Shirt version of this, I get the feeling that 15€ is way too cheap, but I don´t have a clue. Any suggestions on this one?
your help is much apreciated :-)