GJ.8 + 9, 1995/6 1.50P. + 2P., franking a registered cover sent from Buenos Aires to Salta on 8/SE/1996 (arrival mark for the following day), excellent quality, extremely rare! These automatic machines operated only for a few months at the central post office of Buenos Aires, and given all the problems that they had they were quickly taken out of service. Known covers franked with these stamps are very scarce! (Image)