black-toned Patek Philippe automatic skeleton watch.

The watch in the image is a Patek Philippe Square Men's Black Skeleton Automatic Back Open Watch, which appears to be a reproduction or an homage piece, not a genuine Patek Philippe luxury watch. Authentic Patek Philippe watches with skeleton movements, such as the Complications Calatrava Skeleton ref. 5180/1R, are typically made of precious metals like rose or white gold and cost millions of rupees. The watch in the image, often marketed online by various merchants for a few thousand rupees, is a low-cost alternative. 

Key Details

Design: The watch features a square/tonneau-shaped case and an exposed skeleton dial, allowing visibility of the internal automatic movement.

Material: The case and bracelet appear to be base metal with a black or silver-tone finish, unlike genuine Patek Philippe watches which use stainless steel, platinum, or 18k gold.

Movement: It is described as having an automatic movement.

Authenticity: Genuine Patek Philippe skeleton watches have specific reference numbers and are hand-engraved, a process requiring hundreds of hours of work, which is not consistent with the low price point and general appearance of the watch in the image.