Hi again, Jonathan,

Thank you for your appraisal inquiries with Mearto. The item presented appears to be a photo-offset lithograph after a watercolor illustration by CO TAN Long Chau (born 1938), known as "Scout on Patrol" and "Beat tot he End." The image has been produced in print and stamps since its creation in the 1960s, mainly in Vietnam. An extensive biography about the artist can be found in the link below.
http://ape.gov.vn/hoa-sy-co-tan-long-chau-ds1672.th

The estimate provided is based on recent auction estimates and results of this print and other comparable reproduction prints after social realism illustrations by Long Chau, dating to the late 20th century. The estimate is contingent on a full condition report. Please note asking or dealer prices may vary. Thank you and please take care.