Movement Codes Explained

Someone asked me recently why different brands of Russian watches sometimes seem to have the same model/movement number. For example, Poljot 2623 and Raketa 2623.

The first two digits of the code, in this case 26, are the diameter in millimeters. The next two digits are a code that describes the features of the movement.

Here's a link to a detailed explanation of the movement codes for Russian watches:

http://www.netgrafik.ch/russian-codes.htm