This has been previously discussed. #All of the Gibson F-5 mandolins as well as the A-5s made from the 70s, 80s and 90s had the words "Master Model" in their labels. #They are not the same as the current F-5 "Master Model". A 1997 Gibson F-5 or F-5L would have been made by the former Flatiron company in Bozeman, MT. It had a bolt-on neck and lacquer finish. The F-5 Gibson currently known as the "Master Model", which closely replicates the original Loar-signed F5 model, was not made until 2001 or so.
When 'good enough' is more than adequate.