Sorry, It's been a long time since I've posted much of anything.
I have been busy with work that I neglect my collection a bit.

While searching in an online auction recently, I found banknote 1919 Netherlands Indies 1 Gulden (picture of queen Wilhelmina in the middle) but I have no idea what to look for this note.
I tried to find any info in Indonesia but it seems that this note is quite rare.
A collector said that I should collect based on the date.
Are there many date variant for this note and is there a special date that should be collected?
Appreciate any help anyone can offer, thank you.
-Nana-