OMEGA extreme rare chronograph Speedmaster so called Holy Grail reference...

OMEGA extreme rare chronograph Speedmaster so called Holy Grail reference ST 376.0822, self winding, produced in a small series of approx. 1000 pieces, thereof only approx. 800 in stainless steel including stainless steel bracelet, tachometer graduation on bezel, day and date, screwed down case back with seahorse representation and initials RJ, 60 minutes and 12 hour register, 24 hours display at 12, 17 jewels, calibre 1045, base calibre Lemania 5100, central rotor, Kif-shock-absorber, diameter approx. 42 mm, length approx. 19,5 cm, original papers, proof of service and purchase invoice, sold in February 1989, signs of use due to age, condition case 3, condition movement 2, from first owner