i need help to id this bulgarian banknotes

i need help to id this bulgarian banknotes
it is thick paper not like others and with dark yellow lines and the watermarks are so clear

 

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50 Leva 1951, I think.

http://banknoteworld.com/bulgaria?Date=1951

 

thnx my friend
but what about the dark yellow lins ???

 

The yellow lines are consistent with damage from an old photo album. In the 1970-80s there were photo albums that had a sticky substance applied in diagonal stripes that held the pictures in place between the page and a cellophane cover. The adhesive leached into the note from improper storage in this type of album.

 

I remember those, but, never once considered storing any of my notes in them. Very nice observation.