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(1.)There are two identifying features of genuine New Republic stamps. (First) There is a splinter near the end of the top branch of the first "E" in Republiek. (Second) The end of the lowest branch of the second "E" in Republiek is beveled back. (2.) Gerrit H. Jonkers article states that he has examined many New Republic stamps. In a very few cases one or the other of these two identifying features has been missing, but never both.
New Republic Genuine« Back
1886 New Republic, Sketch of Identifying Features of Genuine Stamps, (click to enlarge)

(1.) Splinter near the end of the top branch of the first "E" in Republiek. (2.) The end of the lowest branch of the second "E" in Republiek is beveled back. (3.) Sketch from Gerrit H. Jonkers book. (4.) Notes: do.
1886 New Republic #1 Genuine, 24 Apl 86

(1.) Dated "24 Apl 86". (2.) Splinter near the end of the top branch of the first "E" in Republiek. (3.) Bevel at the end of the lowest branch of the second "E" in Republiek. (4.) The letters of "Nieuwe Republiek" are 2 mm high. (5.) There is a period after "Afrika". (6.) Exp: do. (7.) Ref: Gerrit H. Jonkers.
New Republic Forgery
1886 New Republic #1 Forgery, 20 Nov 86

(1.) Stanley Gibbons catalog does not list a printing for "20 Nov 86". (2.) There is no splinter on the top branch of the first "E" in Republiek. (3.) The end of the lowest branch of the second "E" in Republiek is not beveled. (4.) The letters of "Nieuwe Republiek" are 2.3 mm high. (5.) There is no period after "Afrika". (6.) The inner parts of the small tree-like ornaments in the corners are much smaller than on the genuine. (7.) Exp: do. (8.) Ref: Gibbons catalog, G. Jonkers.