lot # NLI216 - Netherlands Indies specimen
1938-40 photo issue: 40Ct and 50Ct ~ the two values issued in 1940.
Both in a strip of three affixed to part of archive sheet and cancelled 3-line SPÉCIMEN / COLLECTION / MAURITANIE - UNIQUE items from the Mauritania Post Office UPU specimen collection.
The 50Ct was not issued and was sold only at the Philatelic Counter of the Amsterdam Post Office.
NL Specialised 259, 260 cat 3 x €350 = €1050++.