NO, not Tiffany's...but the most formal of printing methods: Engraving, traditionally a mainstay of royal and diplomatic correspondence. Text is etched onto a copper plate, which is then coated with ink and wiped clean, leaving the ink only in the indentations.
Soft, high-quality cotton paper is pressed hard against the plate, causing it to deform into the etchings. The result is raised, crisp text, with warmth and a sumptuous tactile quality that cannot be achieved with flat printing.
It is easy to tell whether a piece of stationery has been engraved (rather than thermographed -- the somewhat less crisp imitation). Simply turn it over. If there is a tell-tale "bruise", caused by the pressure from the press, it is engraved. Another way to tell is to look at the letters closely -- thermographed text is shiny, while engraved text is more subtle and matte.