black paper on postcards

[jimi-zep50]

I have a lot of postcards to sell which have lumps of black album paper stuck on the back. Should I try to remove this or leave it and mention it in my post?   How do collectors like to buy ? Would they still be interested with the paper left on?  The postcards are all from Mexico 1940s and seem quite collectable judging from completed listings

mike

[norseway53]

@jimi-zep50

I collect postcards.  Do not try to remove the paper but you must mention the issue in the description and if possible provide photos.