ISF : İsfila Catalogue
Mi : Michel Catalogue
Papuççuoğlu: Turkish Stamps Specialized Catalogue (1920-1923) 2020
** : Never Hinged
* : Hinged
o : Stamped
FDC : First Day Cover
ÖGZ : Special Day Letter
1927 Stamp in Aid of the Turkish Aviation Society 5k Block of Four partially (horizontal) imporforate & perforation displaced
**
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