Soviet postal rates (1961-late 1970s)

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Internal mail:

Postcards

Surface - 3к
Airmail - 4к
Registered Surface & Airmail - 10к

Letters

Surface - 4к
Airmail - 6к
Registered Surface - 10к
Registered Airmail - 12к

International mail

Postcards

Surface - 4к
Airmail - 14к

Letter

Surface - 6к
Airmail - 16к
Registered Surface - 18к
Registered Airmail - UNKNOWN
Special Delivery - 18к