Stencilled form filled in with typewriter. Signed by the director, Ir/ Nio Tjoe Hauw and an official of the post office Singkep. There is also a seal impression of Perusahaan Pertambangan Timah Singkep (P.P.T.S.) in blue and of the post office in black ink direktur P.N. Tambang Timah Singkep, Ir. Nio Tjoe Hauw. Scribe: Kantor Kas Negara di Kantor Pos Pembantu Dabo Singkep.