Does cartier 925 argent watch alwyas come with must de word?

No. Cartier makes the regular tank watches that have "CARTIER" on the face but they also make the "Must de Cartier" line. This line was introduced in the early 1970s. There are dozens of tank models but only the Vermeil (925) tank with either "CARTIER" or "Must de Cartier" printed on the face -- preferably white or parchment -- retain a value above a few hundred dollars. Many tanks sell on eBay every month for $250-$400. But notice how none of them are the classic tank with the roman numeral dial. In fact, the name Cartier does not appear on most of them. Only the famous Cartier "double C" and the Word "Swiss." These represent the entry level point of the line.

A genuine, fine, classic Cartier tank can be of either brand. What matters is type of face it has, as well as the movement.