The most expensive hmt Models I brought back in December 2003: Kedar De Luxe priced at USD 42. Automatic Day-Date gold plated. This is the Indian take on the Rado Diastar which was wildly popular in the 70ies due to it's revolutionary scratch resistance. I have no information about the thickness of the gold-plating. However given the low price, I assume it must be around 3 micron electro-plated.
In ca. 2001 Titan had patented a new gold-plating that would allow a very thin and very hard layer of gold. Also this new gold-plating technology would increase the life of the gold layer significantly.

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