Album weeds : or, How to detect forged stamps (1882)
Earée, R. B · London : Stanley Gibbons · leaf 532
but printed in various shades of red-brown. Postmarks. ■ Genuine. Three concentric rectangles, containing Turkish letter- ing in the centre ; also a large double circle, containing Turkish lettering both in the centre and between the circles. First Forgery. Three concentric rectangles, as in the… … outlines of the stamp are of equal thinness. Forged. Nicely lithographed on thick, soft, very white wove paper ; per- forated 13. There are, as in the last sets of counterfeits, only forty- three pearls round the crescent and star, and the coloured line round the stamp is considerably thicker than…
Postage stamps
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.