The cover that is made in Ukraine, was made in the days when it was under the rule of the Soviet Union.
Photographer’s Notes: Made in USSR, Yenakijeve, Donetsk region, 1959 ГОСТ - ГОсударственный СТандарт => GOST - state standard or governmental standard of 1947 year). ГК - (Городская Канализация => City Sewerage)
M.C. - Министерство строительства (Украинской ССР) => Ministry of Construction (Ukrainian SSR) Builder: ЕНАКИЕВСКИЙ К.М.З (котельно-механический завод) => Enakievo Boiler and Mechanical Plant. (Thanks to Vuori Susi for the clarification)