Tibet Bank Note Date [opgelost]

Is anybody Familiar with Tibetan Shrang Banknotes who can Date the Notes I have as I am not very ofay with Tibetan I have Standard 1976 Catalog of World Paper Money by Albert Pick but cannot make head nor Tail of the Numbers on them help would be very much appreciated I will add to Numista how I found them sometime next Week.
Ian.

5 Shrang
10 Shrang
25 Shrang
50 Tam
100 Srang

Please refer this screenshot

Thank you I have managed to identify the Dates and put them all onto my collection.

I don't think the banknotes are dated.

BTW, the currency in spelled Srang but pronounced as Sang.

I looked at the bank note museum for Tibet and it shows how the bank notes are dated but its not that easy I can identify some of the sequence but not all but then you could be right as all notes could be the same for all year'. Ian