I hope I don't regret this.
and if it matters which one was not gummed it was the 24 which I highly doubt it matters which, and if im wrong I will be ever so humbled, but would like to be mentored in why that would be the case. [emphasis added]
For your question of how the total market value of the set is affected, it is 100% critical to know which
particular stamp is affected. The stamps are not all priced the same in the catalogue. If a stamp with a higher catalogue value is the "damaged" stamp, that affects the total market value of what you have.
You might have to look a long time to find just the one stamp that you need, but if and when you find it, you'd certainly be happy that it has a lower catalogue value than some of the others, as it should
be cheaper to replace it. On the down side, that one single stamp is probably less likely to already have an existing cert.
Think of it this way. If you open your wallet and see three $1 bills, a $5, two $10s and a $20, and I reach in and take just one bill, how much do you have left in your wallet? You'd have to know which bill I took. Not exactly
analogous but pretty darn close.
Note that you can see in the Michel excerpt that they price the four Reichsmark
values as a four-stamp set, not as a part of a 23-stamp set. That means that, assuming your expertizer marks are genuine, you have a good set of the high values and a set of the low values with one MNG stamp.
As long as I'm taking a minute to reply, two quick suggestions.
One, don't use CAPS to distinguish your replies. Switch to "full reply" and use italics to set off your responses, or use the quote button to highlight the material to which you are responding. You can use the quote button more than once in the same reply.
Two, keep in mind that this is an international forum and many users rely on translations to correspond. Or, if corresponding in English, it may not be a first language. What you're reading might not necessarily
be intended as an insult. Sometimes, it is. (I'm saying this generally speaking
, not as a specific comment on this thread.)