Omega belongs to the Swatch Group, which the Hayek family controls with a quarter of the capital and 43.6% of the votes. On the two references checked, the Indian price is about 8.7% below the American one before tax.
Longines is one of the very few watch brands that publishes both Indian prices and Indian service costs in rupees. We check them against the US and Swiss lists, and settle the in-house movement question.
Rolex publishes a rupee price for every model. On a tax-stripped basis an Indian Rolex is about 20% cheaper than the same watch in Switzerland, and 18% cheaper than in the United States.