This is an absolutely awesome and rare midsize AP Royal oak 4100BA in 18k yellowgold. The watch is carrying all the original parts from the early 1980s, and it´s ap 2123 automatic movement has received a fresh service about one year ago. the „swiss“ -printed grey dial  and hands are untouched and carry the original tritiumlume. the 35mm goldcase (serial 18xx) and the bracelet are in great and very sharp condition. the bracelet has almost zero stretch. this beautiful vintage royal oak will come with a leather travelbox.