Some of the high-value colonial stamps in my collection come expertized, by one or two relatively known experts from the past. Do these seals add anything to a stamp's genuine-ness?
1. Expert marks can (and sometimes often are) be faked/forged. 2. Many advancements have been made in detecting faked/forged stamps in the last few decades. 3. The knowledgebase of faked/forged stamp has increased in recent decades.
For the reasons above, I typically place less value in old experts marks then I do with recent certifications. Don
They don't create or add "genuineness", which already exists, but they can confirm it make a sale easier. The complication is that expert marks have themselves can be, and have been, faked.
Depends on the expert. Some of the "experts" have been proven incorrect for many different reasons in the passage of time and newer investigative techniques have prevailed.
The question is very broad and general. Especially without illustrations. It needs to be dealt with on a stamp by stamp basis. Whose mark is on what? Each expert had their own areas of knowledge. As you can see from the other replies and links - it all depends. Do you have a specific example to share/discuss?
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