A very rare pre-series / prototype example of the FED TSVVS camera, distinguished by the complete absence of any engravings or markings on the top plate—an important feature identifying it as an early experimental variant preceding regular production.Produced in very limited numbers around 1949–1950, the TSVVS is among the most unusual Soviet rangefinder designs, combining a Leica-type body with a Contax bayonet mount. These cameras are generally believed to have been intended for military or institutional use, reflecting a transitional phase in post-war Soviet camera development.The present prototype example is fitted with a Carl Zeiss Sonnar 1.5/5cm lens, no.3051745, in keeping with early configurations using high-quality German optics.