Overprint on Mi:SU 6025/Sg:SU 6072. This item has been denounced (in general) in Georgia 2012 UPU Circular 75 as illegally produced without the authorization of the postal administration. They have no postal validity. Please view Abkhazia stamps in the main stamp category to see validated stamp issues.
Produced by the British counterfeit producer and still being distributed by associated counterfeit stamp dealers to this day. Avoid sellers of these!
