The highest craftsmanship on the market – later upgraded to 18K solid gold AP15412BC. Details as shown in the pictures. 3132 integrated movement modified with a non‑indexed weighted balance and a skeletonized double balance wheel.

This message refers to the same AP 15412BC skeleton “Red Gem” VIP build described earlier, emphasizing that it represents the highest craftsmanship available. The “later upgraded” part suggests that the watch started as a steel or base version and was then upgraded to solid 18K gold (likely white gold) – a significant enhancement. The movement is a 3132 integrated caliber that has been modified with a true non‑indexed weighted balance (adjustable screws) and a skeletonized double balance wheel – a complex, high‑end feature that is the hallmark of AP’s most exclusive skeletons. The seller invites potential buyers to inspect the details in the accompanying pictures , which would show the gold finish, gem setting, and movement finishing.

For collectors, this build is the ultimate expression of an AP Royal Oak skeleton: solid gold case, ruby and diamond accents, and a movement with genuine high‑horology features (non‑indexed balance, double balance wheel). It is not a budget build but a showpiece for those who demand the best.