Answer first
A replica Cartier Rotonde skeleton is a copy of Cartier's openworked Rotonde watch. It is not a Cartier product. The original uses Cartier caliber 9611 MC. Replicas copy the Roman numeral bridges and the open dial. Check the movement, case finish, markings, and paperwork. Expect no Cartier warranty, unknown water resistance, and legal risk in the US.
What the original watch uses
Cartier lists the Rotonde de Cartier Skeleton with caliber 9611 MC. The movement is manual wind. It has 138 parts, 21 jewels, and a 72-hour power reserve. The bridges form Roman numerals. The crown has a blue sapphire cabochon. The caseback is open. The dial has no solid face. The hands run over the open movement.
What replicas copy
Replica makers copy three features: the open dial, the Roman numeral bridges, and the case shape. Many replicas use a decorated movement that looks like the 9611 MC. The decoration can be printed or applied. The gear train may not match. The power reserve may be shorter. Some replicas use a closed caseback or a mineral crystal. Check these parts.
Checks before you buy
- Movement type. Ask for a photo of the movement. A manual-wind movement with a balance wheel at 6 o'clock matches the layout. A quartz movement does not.
- Bridge shape. The Roman numerals should be part of the movement bridges. Printed numerals on a plate are a sign of a low-grade copy.
- Case finish. Look at the lugs, bezel, and caseback edges. Sharp edges and uneven brushing show low finishing.
- Crown. The crown should have a blue cabochon. Check the shape and the setting.
- Markings. Check the caseback engraving. Reference numbers and serial numbers should be crisp. Blurred text is a defect.
- Strap and buckle. Check stitching, leather grain, and buckle engraving. A light strap on a heavy case is a mismatch.
- Timekeeping. Ask for a rate reading. A new mechanical watch should run within a stated range. Ask for the range in seconds per day.
What a replica does not give you
A replica has no Cartier warranty. Cartier will not service it. Parts supply is uncertain. Water resistance is not tested to the original rating. The case may not seal. Do not swim with it. Resale value is near zero. The movement may use generic parts. A watchmaker may refuse service. Ask about service before purchase.
Legal note for US buyers
Counterfeit watches are illegal to sell in the US. US Customs and Border Protection can seize counterfeit goods. A replica Cartier with a Cartier trademark is a counterfeit good. Buying one carries risk. The seller may face trademark claims. The buyer has no Cartier support. Check the law before you buy.