China PRC Stamps 1968 W11 Block of 4 with Upper Right Corner Margin Lin Piao MNH OG Sc# 997

1968 W11 Block of 4 with imprint margin at left.  Mint never hinged with original gum.  Tiny faint thumbnail bend on top left of center margin area and faint bend on top right corner margin - fairly difficult to see so I took a picture in a darker area and at an angle.  Mentioned for accuracy.  None of the stamps are affected.  Still very fine.

Please see pictures.