1944/65 (ca.) holding of ca. 600 unused/CTO/used airmail letter sheets, mainly with overprint on folding letters from South Africa, while revaluations, forms, OHMS etc., all multiple, high catalog value (Image)

1948/61 ca. 900 unused and unfolded aerograms, many with overprint Swaziland on issues from South Africa, incl. the first aerogram with introduction of the decimal currency and corresponding conversion (H&G F18), many types and different positions of overprint, excellent study material (Image)