Combination
Automatic Station "Luna 16"
Bulgaria 1970 / Mini-sheet (issued November 14th) imperf. / mint condition /
Michel #Block 28 / Yvert #BF30
+
Lunokhod 1
Bulgaria 1970 / Mini-sheet (issued December 18th) imperf. / mint condition /
Michel #Block 29 / Yvert #BF31