According to the Archives of Omega, the present watch was delivered to Bulgaria in 1938.
The first Omega wristwatch was produced in 1900, featuring like many of the early wristwatches a hinged case back similar to that of a pocket watch. By the mid-1930's, the case designs had evolved to look more like the wristwatches we are familiar with today, with elongated lugs and a flatter bezel and case back.
A typical wristwatch of the period featured a case diameter of around 30 millimetres. The present watch, being 37.5 millimetres, was incredibly large for its time, and thus rendering it a very contemporary look and feel despite its nearly 80 years of age. It furthermore impresses with its very good, original overall condition, in the charismatically aged silvered dial with the superb sector scheme (also called aviator dial), often found on watches made for military or scientific use.