Final production date of the 218
I ask this because I thought 1977 was the last production of the 218 movement. There is watch WUS that has a 2182-f with a production stamp of P0 (1980). I'm positive this was a replacement movement because it sits in a 1969 Accutron case with a proper caseback. It has a Bulova service mark of *644. Would a movement have been produced if this was replaced in 1980? Were there others made just not used after 1980? This had me really curious and hopefully someone here can help.