Malaysia 2012 $100 Replacement ZA 0043210 Uncirculated

***The collection of Malaysian Replacement issues is a very serious affair among Malaysian numismatic collectors as some Replacements might take many years of hard labor income before one can even get a sniff at one, the finest example of which is the $100 ZU Replacement printed by the US Banknote Co which costs a bomb to locate, not to mention, to acquire.
Unless corrected, Malaysians must rank as Number One as far as the collection of Replacement issues is concerned.
And also, there is an endless stream of Replacement issues for the various denominations printed & sometimes, it's Replacements galore...
But how many Replacements are there with extremely low serial numbers or those with Solid Numbers or even those wth Ladder Numbers or some other freaking 'funny' numbers?
Is 0043210 considered as some sort of the 'Reversed Ladder' Number, if there is such a thing in the first place?
Maybe some Pakar Numis' or even some Smart Alecs out there could shed some precious light on this?!