Tham Bao Recon Unit, KBC 4142 Return address is from a Recon Unit (Tham Bao) of the 21st Infantry Division (SD21BB). The division insignia appears in the upper left corner. Warning! Covers of this design are fakes currently being produced in Viet-Nam to deceive collectors. < Back < Imnaha Stamps Home Original content ©2008 Andrew Crenshaw - All Rights Reserved.