drakken
**Member** 
Posts: 6
What I collect: Germany
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Post by drakken on Feb 9, 2024 12:50:20 GMT
Dear friends. I have this collection of Thurn and Taxis (north and south). Complete, with many replications, used and news. I expertise most of them, and many have expertise by other people (just sign in the back). I check the cancellations, and revise in detail according the stamps and the Fourier suggestions of forgeries. However, one colleague told me “I am not interested, there are many fakes in this collection”. However, I cannot give me any clue. I found some suspicious stamps (I cannot determine if they are forgery neither it is real, and mark with “?”). But to date, I am interested in the cancellations... can you give some advice in how to improve the self-expertise in this issue in particular? Thanks in advance, Dr Guillermo Martinez Pastur (CEL54_2901_420866)                          |
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JeffS
Member 
Posts: 2,610
What I collect: Oranges Philately, US Slogan Cancels, Cape of Good Hope Triangulars, and Texas poster stamps and cinderellas
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Post by JeffS on Feb 9, 2024 13:31:23 GMT
That certainly is more T&T stamps than I have seen in my lifetime.
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Post by greaden on Feb 9, 2024 13:57:26 GMT
The inner ring should be 12.25-13mm across. Smaller distances are forgeries. The numbers must be centered, and in one distinctive font. The rings should be even, with some exceptions Examples of the correct postmark are here: www.stampsx.com/ratgeber/stempel-tt-nrs.phpSome towns such as Frankfurt (220) had multiple offices with some variation. I see only one of them on that site. I am searching for the title of a German-language book with correct examples of all the marks. I believe it is this: : Thurn u. Taxis Stempelhandbuch, H. Haferkamp & E. Probst, vols. I-III, Frankfurt, 1976 Postmarks on the last issue, and on the 5 and 10sg, and on the 15 and 30k stamps are especially suspicious. 6, 34, 95, 142, 195 were used by the forger Fournier. There are ways the correct ink will react with the paper that show up with UV lights, but I am still trying to figure out this method. |
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drakken
**Member**
Posts: 6
What I collect: Germany
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Post by drakken on Feb 9, 2024 17:54:49 GMT
Really thanks Greaden! I will check them with these instructions. I will try to find the literature. Regarding the UV, interesting... I will explore. I see them under scope, and nothing is rare... but once I hear about the reaction test with the ink... but nobody told me wich is this "secret method" used by some guys (I wonder if no damage can produced for the stamps). I will get back with more news, just to share!!! In fact I found one FAKE, here the comparison: left real, right my stamp,   |
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Post by greaden on Feb 9, 2024 18:23:41 GMT
A key source in English is the EF Hurt article on Thurn and Taxis in Volume 8 of the Billig handbooks, 1948.
For the UV test, shine a longwave UV light on the back of stamps printed on white paper. If the cancel ink only looks black it is bogus; genuine cancels should look orange to red-orange. A lot of the ones I examined were yellowish, and I do not know if those count. Ordinary blacklights do not work. You need a light with a narrow spectrum.
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Post by greaden on Feb 9, 2024 23:26:12 GMT
I am reluctant to use the LUV too much because of the risks to skin and eyes, but I did examine a few postmarks, and see that there is an umbra that is red-orange, and a penumbra that is yellowish. Through a color-paper stamp certified by a BPP expertizer, it was a faint dark-red.
Regarding sources, Feuser is another author illustrating correct numeral cancels.
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drakken
**Member**
Posts: 6
What I collect: Germany
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Post by drakken on Feb 11, 2024 13:24:50 GMT
Uau, I will explore this options, really thanks.
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