Were the producers playing with the viewers of the TV series MASH by having a Huey helicopter which was not developed until the early 1960s hanging in Colonel Potter's office?

The series was set in the sixties so its not that unusual. WRONG! MASH was set in the Korean War, which was 1950-1953. The helicopters used in the tv show were Bell 47s. The UH-1A "Huey" was developed by Bell Aircraft in the late 1950s and pressed into service in Vietnam about 1963-64, but it did not exist during the Korean War. I watched MASH all the time but don't recall a Huey picture in Potters office. It may have been a picture of the Sikorsjy S3 which did see extensive service in Korea and the early years in Vietnam.