Let’s see what’s on these stamps from Spain.
They were put on an envelope sent to me from an Ebay seller from Barcelona.
There was a single stamp from South Africa inside, to add to my collection 
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Issued 2015, Jan. 2
Die Cut Perf. 13 | Booklet Stamps | Lithography
4010a Moon Gate, Cordoba | 42c | multi-colored
4010c St. Mary’s Gate, Hondarribia | 42c | multi-colored
[Source: 2021 Scott Standard Postage Stamp Catalogue, Vol. 6A]