Based on the file 6a3c51e9a6f2d0.jpg, this timepiece is a Rado Centrix Automatic Open Heart (specifically resembling the green-dial variant, Ref. R30008302).

Here is the best description of its key features:

Design & Dial

• The "Open Heart" Skeleton Dial: The most striking feature of the watch is its beautifully cut-out, skeletonized dial architecture. It artistically exposes the intricate gears, balance wheel, and inner mechanics of the Swiss movement underneath.

• Colorway: It features a rich, vibrant green annular outer track with a subtle gradient effect, accented by polished minimalist hour indices and sleek stick hands.

• Branding: The iconic moving anchor symbol sits proudly above the silver-toned RADO logo and "AUTOMATIC" text printed at the 3 o’clock position.

Case & Bracelet

• Case Structure: A refined, polished stainless steel round case with a classic crown. It is topped with a scratch-resistant sapphire crystal to protect the openwork face.

• The Bracelet: A premium multi-link integrated bracelet that seamlessly flows from the lugs, featuring polished steel outer links and a comfortable, tapered fit.

Internal Mechanics

• Automatic Movement: It is powered by a high-precision Swiss automatic caliber (typically the Rado R734) which boasts a robust 80-hour power reserve.

• Exhibition Case Back: The reverse side of the watch features a transparent sapphire crystal window, letting the wearer admire the automatic rotor and movement decoration from both sides.