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So for a single Pick number (115a) it appears there are different signature combinations, front and back, and multiple series, dates etc with no mention of what these are in the SCWPM issue that I have and El Salvador is one of the several Latin American countries missing from the 2014 Banknote Book volumes.

Have you made any progress on identifying the signatures, how many variants, and any additional series letters since posting? A very interesting undertaking and one that will be ongoing, as they always seem to be. For me at least. 

I wonder if TDLR would be a viable resource? This being a modern note they may be able to look in their archives or provide some additional info.  When I contacted Pobjoy looking for mintages for IoM modern coinage that was a bigtime bust.   But Pobjoy is completely dysfunctional, TDLR seems more helpful from what I've read on other forums. 

From my own research the President appears to be Edgardo Suarez Contreras but I still have no idea who the others are!

Front issued date 1971 + Juan S. Quinteros signature on the back + Large seal =
GN - GW
QA - QJ
HQ - HZ
PK - PT

Front issued date 1972 + Juan S. Quinteros signature on the back + Large seal =
IA - IJ

Front issued date 1972 + Jorge A. Dowson signature on the back + Small seal =
UB - UK
EF - EO
RK and RL

Just to complicate matters the signature and seal positions on the back also vary but it is starting to look like P115 may be simpler than some of the other 1 colon issues and that's before even looking at other denominations. It may be many years before notes appear to allow all the missing gaps to be filled. As you suggest TDLR may be able to help as could the Central Bank for El Salvador, it appears that such information is surprisingly difficult to find - it must be there somewhere though!

Given my interest in the earlier notes I thought putting a few 'modern' sets together would be a worthwhile, and simple, side project.

It looks like TDLR are usually a great source of information however given the thread on Venezuelan specimen notes over at IBNS it appears they are without an archivist at the moment and therefore are not able to help.

From their FAQs at https://www.delarue.com/faqs

On 6/18/2022 at 8:59 AM, ColonialCoinsUK said:

It looks like TDLR are usually a great source of information however given the thread on Venezuelan specimen notes over at IBNS it appears they are without an archivist at the moment and therefore are not able to help.

From their FAQs at https://www.delarue.com/faqs

How can I enquire about a currency collector question?

During COVID19 we are unable to answer the questions that would previously have been answered by our archivist.

Well that stinks! 

I glanced that thread at IBNS a while back but was hopping that TDLR had gotten back to business as usual. Hopefully they get everyone back in the building or hire an archivist in the very near future.  Not a dead end just a delay.