The 4 Trangka, blue color stamp from the 1914 issue of Tibet is the rarest and most valuable stamp of Tibet.
4 Trangka, The small rays from the ring in every corner of the stamp point inwards
8 Trangka, The small rays from the ring in every corner of the stamp point outwards
GENUINE STAMP, The small rays from the ring in every corner of the stamp point inwards
Unfortunately, ebay image server shrinks the images dramatically but I feel this guide will, help you and eventually safe you a lot on money.
Being able to distinguish between the two values of the second series helps in identifying many 4 Trangka forgeries. Many stamps being offered as the 4 Trangka value are in fact forgeries of the 8 Trangka, but printed in blue.Of course, this rule is not valid for all of the 4 Trangka blue forgeries in existence but valid for at least 95 % of the forgeries offered.
These stamps are frequently offered on cover, any cover with these stamps (and other Tibet stamps) looking like the ones shown here are ALWAYS FAKE