Variations: Early Series? Missing Security Strip? Post It By Variation + Nation Name & Series

I would like to start a number of individual threads for collectors who are interested in collecting tougher (or simply popular) Variations of recent issues. When I write recent issues I mean banknotes from 1960 and later & by variations I mean a more collectible note due to design uniqueness, short/limited or recalled prefixes. I will use this thread as an example & hope to get CCF member questions, feedback & input in this thread here. If you wish to contribute feedback about a particular national variation than please add these to the variation-nation thread. If you wish to provide input/feedback to the theme of what is collectible (or general opinions about recent price changes for variations, etc) than contribute to this thread:

So, for example, the Bank of Canada (BoC) first issued the Journey series in 2001. The first short prefix was FDY which caught collectors by surprise:


And later still the 2001 FEE change-over:


The variation may not be that specific. It could be early Belgium 100 Francs banknotes with the signature on the front (3 years) as opposed to P-142 (with signatures on front & back):

http://www.banknote.ws/COLLECTION/c.../BEL0140.htm

Other examples could be the 1993 East Caribbean series which lasted only 1 short year

- probably as the markers were tough to see!
... or the 1992/93 50 Francs P-157a from France;
probably due to some errors within the deign.

The idea is just to post a note which you think was short lived due to some design flaw, security compromise, or for whatever reasons.