The serial FAB-634 was issued twice. This particular one is former French 21400, it was delivered as F-ZVLD through Glasgow 19 June 1985 and ended up at the PMA as a assembly/disassembly trainer. Seen from 1994 to 1997, it was probably scrapped shortly after. The other FAB-634, former F-ZVLJ/21132 was upgraded in 2001 and flew around in special anniversary colours and is now stored. In case you are wondering: it was seen at the same day, 9 January 1997 as 21132 stored at La Paz! So I suspect it only took up FAB-634 after its upgrade. Also, many T-33s are composites of two halves...