Y158 Kristina -

Several mid-tier stock agencies (particularly those based in Ukraine, Russia, or the Czech Republic) use serialized naming for their model releases. For example:

The most concrete reference for points to a line of mechanical wristwatches produced in a collaborative effort between Swiss movement makers and Swedish assemblers during the late 1950s and early 1960s (the "y" in y158 often being a factory code for the 1958 production run). y158 kristina