This is a pair of lovely South Africa Oceanographic Studies Reply Cards.  They were sent from Kelso Station and Groutville Station to Congella, Natal on 10/30/1962 and 6/30/1963 respectively.

These are a RARE pair of Modern Postal History!

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You have the option to have it shipped via regular or Priority Mail in the US, and Registered Mail overseas!  This does cost more, but it comes with tracking, and will help ensure the item reaches you in a safe and timely manner!