Ok, I'll bite...
All except #3 appear to be mlumah (viewing only a small part of the blade makes pinning down miring-type pamor which looks like mlumah tough).
All except #4 have the typical Jawa surface and without additional hints from the whole blade, I could only guess which is genuinely old and which received treatment to artificially age it... #4 seems to have been extensively reground/repolished with a little bit of prior corrosion still left at places - doesn't look like Alan's work though.
#2-6 all appear to be forged with nickel or high nickel alloys of whatever source. #1 could possibly be phosphorous iron (or low-nickel alloy?) but the many pamor layers make it tough to get a clear picture of the utilized materials.
#3 has interesting pamor material - meteoric from a Javanese perspective? Also the iron utilized looks interesting; and old. (Or does the heavy etching fool me?
Maybe in #1 and #5 the iron got washed more extensively prior to doing the pamor. Or rather mild steel?
All in all, I like #1 and #3 best.