Now showing: Guatemala - Air tax stamps (1919 - 1945) - 3 stamps.
10. January WM: None Perforation: 14
![[The 150th Anniversary of the US Constitution - Central Post Office Stamp of 1927 Overprinted, type B5]](https://www.stampworld.com/media/catalogue/Guatemala/Air-tax-stamps/B5-s.jpg)
13. April WM: None Perforation: 14
![[Central Post Office Stamp of 1927 Overprinted "1938" in Red or Blue, type B6]](https://www.stampworld.com/media/catalogue/Guatemala/Air-tax-stamps/B6-s.jpg)
20. November WM: None Perforation: 14
![[Stamp Exhibition, Guatemala City - Central Post Office Stamp of 1927 Overprinted, type B7]](https://www.stampworld.com/media/catalogue/Guatemala/Air-tax-stamps/B7-s.jpg)
