SBK #F20.Ab; 1937 10r on 15r Deep and light green, inverted surcharge, never hinged, very fine; signed Müller-Basel (SBK CHF10,000).
SBK #F20.Ab; 1937 10r on 15r Deep and light green, inverted surcharge, never hinged, very fine; signed Müller-Basel (SBK CHF10,000).
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
