Lot 375
 
Switzerland, Airmail, 1919 2½rp Trial Overprint, SBK #F2a, n.h. in red in pair with normal, Fine to Very Fine. 1979 discovery, Ex Katcher. Zumstein (1979) cert., signed also.
Michel #152. SBK 3,600 SFr (from), , very few exist (approximately 5 per Katcher for this and 34 copies for all trial colors) .
Estimate $700-900.
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| Realized $1,725 |
