Audemars Piguet - Royal Oak II Ref. 8638ST

The Classic Royal Oak for Ladies!

In 1976, Audemars Piguet presented the 8638 model. A smaller version of the reference 5402 introduced in 1972, it was aimed at a female clientele. Like its big brother, the small 29mm ladies' model was initially only available in steel and was equipped with the automatic caliber 2026. The reference 8638 is therefore the version of the original RO Jumbo that was only 10 mm smaller. By 1978, versions in bi-color, yellow gold and white gold were also produced.

Our 8638 presented here dates from around 1978 and has the rare “Royal Oak II” lettering on the case lid. In total, only around 1400 of this reference were produced.

The dial has developed a wonderful brown/greyish patina over the decades. The dial is authentic from the period. The case itself is in good condition with signs of wear on the bezel ring and on the flanks.

The strap also has signs of wear and stretching. The hands were renewed once during an earlier service and now have a newer luminous coating.

Functionally and technically, the watch is flawless thanks to our service.

The bracelet circumference is approx. 16.5 cm.

The watch has been fully serviced by our workshop and comes with a 1-year guarantee.

Our Service

Each vintage watch is individually selected and carefully checked by us. Once we have purchased a watch, it is mechanically and fully tested and inspected in our watchmaker's workshop. If necessary, the movement is fully serviced to ensure it meets our high standards.


We will always describe the watch as fully as possible in our sales texts. Our zoomable images are of the highest quality and form an important part of the description of each watch. Therefore, we do not retouch our images. We will never hide or cover up any element of a watch we sell.


One element of our unparalleled service is fully insured courier delivery with personal handover. Once you have received your watch, we recommend that you check it thoroughly. If you are not 100% satisfied, please let us know. We offer a 14 day returns policy. Simply return the watch for a full refund of the purchase price.

Our Warranty

We offer a one-year guarantee within the EU on the mechanical function of the watch from the day of purchase within the EU. We do not guarantee the water resistance of (vintage) watches, unless expressly stated in writing. Therefore, our warranty does not cover damage to the case and/or movement caused by water or moisture entering the watch. Our warranty does not apply to accidental damage or improper handling of your watch and does not cover the bracelet, case parts (including pushers, winding stem, crown and bezel), watch glass, dial and hands.