810-17 PRC S69 1964 in blocks of four, with the usual partial black outline of the workers on the reverse of some stamps, and 812 has a paper inclusion and brown smudges on the reverse of one stamp, see second image (2 images)

810-17 PRC S69 1964 in blocks of four, with the usual partial black outline of the workers on the reverse of some stamps, and 812 has a paper inclusion and brown smudges on the reverse of one stamp, see second image (2 images)