1926 "Model Post Office, Sesquicentennial International Exposition, Philadelphia, Pa." (Bomar P26-02a), bold strike of three-line handstamp on front from Great Britain to the exposition in Philadelphia Pa. bearing G.B. ½d strip of three and 3d pair, all tied by four strikes of London (11.5.1926) cds, reverse with additional P26-02A strike and Model Post Office Nov. 17th duplex (Bomar P26-01) and Model Post Office roller postmark (P26-08); cover has been reduced and pasted together, F.-V.F., This is the only recorded use bearing these three different postmarks. Estimate  $300 - 400. $0 (Image)