Rare Rolex Datejust ref 6605 Black Gilt Dial with 'OFFICIAL TEST' Text


SCBOT text for rare testing lines…

We are delighted to be offering a rare and stunning yellow gold Datejust. The watch has a dial version that we have never seen before on a Datejust (possible unique) and features the chronometer text: “SUPERLATIVE CHRONOMETER BY OFFICIAL TEST”. The Reference 6605 saw to introduction of the new 1065 movement, which suggests this exact watch is a prototype model to test the new movement. 

The dial is gilt, in great condition and featuring unusual heart-shaped hour markers and a gold frame around the date window.
The watch has the additional nice touch of still having the original yellow gold BREVET winding crown that features the prominent ‘+’. This is arguably one of the most collectible and rare Datejusts that we have offered and would be a super addition to any watch collection! The watch has been fully serviced by our watchmaker and will come on a Bulang and Sons leather strap.


- Reference 6605
- 36mm yellow gold case
- Serial 137xxx dating to early 1956
- Black gilt dial with rare markers and SCBOT text
- Original BREVET ‘+’ crown
- Comes on a leather strap 
- Fully serviced by our watchmaker
- 1 year mechanical warranty
- Includes a handmade single leather watch pouch
- Free worldwide Fedex Priority shipping

We Love Watches

We are passionate about vintage watches and we love talking about them! That is why we don't sell our watches with a simple "Add to cart" button, but instead try to emulate a truly boutique experience online. Helping you find your perfect vintage watch is our Watch Department’s raison d’etre. Whatever you would like to ask, please do. Building our community of watch lovers is central to our mission at Bulang and Sons.

We Know Watches

At Bulang and Sons we have sold thousands of watches over the years. We are a small team of experienced collectors and connoisseurs who are all part of an extensive global network of buyers and sellers. We have a great reputation for offering only the highest quality watches. We have one simply rule: we only buy and sell watches we want to own ourselves. And yes, we are still collectors too.

We Guarantee Watches

As collectors, we know how intense the search for a specific vintage watch can be. Once you find it at Bulang and Sons, we want to make things easy, safe and fast for you. Therefore, we offer the most comprehensive return policy and warranty; you will not find a safer place on the internet to buy a vintage watch. You can relax and enjoy your deal with Bulang and Sons.

Customer Reviews

Be the first to write a review

You may also like