125-26 (128-29) $500 blue and red Sultan Ibrahim and a pair of 8¢ bright violet and slate 40th Anniversary, tied by Johore Bahru cds to piece of what was probably a high value registered cash transfer letter, this is thought to be the only existing postally used example of the $500 (which even mint catalogues £24,000 and is, in the used state, obviously much, much rarer!).
