The SEIKO 7005-8030 is confirmed as an issued watch to special forces during the Vietnam War. The owner of this piece tells me the watch was actually in Vietnam and was not a civilian purchase later on.
This piece dates to 1970 and was in very good condition. I ended up servicing the watch, replacing the seals, crystal and some parts inside that were damaged due to water intrusion. It’s now running great and ready for a few decades more service!