Small Queens Help Please

I've just purchased a job lot of small queens and have few queries if anyone is able to answer (thank you in advance).
The first picture is of two sc37's as they have a small dot under the left hand side (seen by microscope).
The one on the left appears to be a standard 37 ?
The one on the right is a brownie colour..could this be Copper or Indian Rose.?
They are both Perf 12
The second picture I'm not sure wether it is a 37 or 41, it's more reddish than orange. I cannot see a dot under the left side, but on measuring the perf several times it appears to be 11.5 x 12.
Any ideas would be welcome please,

Rfw, your second stamp is badly oxydized - it is not a different color


Peter

For more info on color changed stamp https://stampsmarter.org/learning/H...idation.html
Don

Thanks for responses, thus far…as far as oxidisation is concerned would you say that is what has happened to the stamp on the right of this new picture.
I'm assuming the left hand one is sc40 and the other two are sc45 ?

Yes. you are correct about the oxydation


Peter

My guess
1. Pale Magenta
2.Rose Carmine
3. ? looks similar to a die proof on India colour.