Overprint B group "b" 

This overprint was used on stamps Pofis / Trojan  
number 52  54, 84  88 (air and postage due provisory, except 1h.)  


Overprint
B  group "b"  type I.


The height of the overprint is 10,5 mm, the length 20,5 mm.  
The height of the letters is 2,6 mm, the angle is 28º.  
1. The axle of T pass the right part of O and touch the right part of 1.  
2. In the K is a small cut, the upper part of S has a deep cut.  
3. The second 9 in 1919 is cut.  


Overprint B  group "b"  type II. 

The height of the overprint is 10,5 mm, the length 20,5 mm.  
The height of the letters is 2,6 mm, the angle is 28º.  
1. The axle of T pass between O and V and between 1 and 9.  
2. The K and S are without the cut.  
3. The second 9 in 1919 is cut.  


Overprint B group "c" 

This overprint has been used on the stamp Pofis / Trojan 83 1h PORTO  


Overprint
B  group "c"  type I.


The height of the overprint is 10,5 mm, the length 20,5 mm.  
The height of the letters is 2,6 mm, the angle is 43º.  
1. The axle of T pass the left part of V and pass between  
1 and 9.  
2. The hook over C is easy to see.  
3. The second 9 in 1919 is cut. 



Overprint
B  group "c"  type II.


The height of the overprint is 10,5 mm, the length 20,5 mm.  
The height of the letters is 2,6 mm, the angle is 43º.  
1. The axle of T touch the left part of V and of the second 9.  
2. The hook over C is just a dot.  
3. The second 9 in 1919 is cut.  