In addition to the Patriarch of Constantinople (who gives chrism to all the Greek Orthodox and Arab churches) and the Patriarchs of Moscow, Serbia and Romania as well as the Metropolitan of the OCA, who are the other heads of autocephalous and autonomous churches who make and bless Chrism? (I understand that ROCOR consecrated chrism in 1950, which has lasted them until the present, but that they will henceforth receive chrism from Moscow; they had received chrism from Serbia from the 1920's to 1950.)
I'd also like to know why chrism seems to last so long in Orthodox churches. It isn't often that the chrism is blessed, right? And is it true that in some areas, century-old chrism is still used?