Speedmaster 345.0808, purchased in 1991, and worn only rarely. Gold plated calibre 863 movement, sapphire back, model introduced in 1980. I serviced it the first time, one week ago (March 14), did a minor regulation on March 16, and set it to the second. Over the past five days since I re-set it, it has picked up one second! I have read on this message board of the accuracy other owners have had from these watches. I am now a believer!