ERF-NGC-European:
I reckon 1557PF89’s 13-sp Fuller 'box was probably fitted by MABO, as it left the factory with a Fuller RT9509A. NTC 335 engined NGCs did leave the factory with 9-sp Fullers and a few were retro-fitted with 13-sp boxes by the importer. For example, this is exactly what happened to the Corbishley example: it left the factory with a 9-sp and CDB in Brussels re-fitted it with its 13-sp box.Robert
RTO 13 speed or just RT ?. 
