I am posting five stamps from a collection I acquired recently and still learning my way around the stamp grading world. (I am a coin collector and know the coin grading system well but new to stamps.) The collection was full of fairly nice stamps which had been selected with some care. Many are MNH examples, some are MH and a few used. Here are examples of five which I will describe my findings and let me know what factors I am missing.
The first is a Scott #29 1857-1861 5 cent brown. I see this as well centered, no paper faults but might grade fault due to heavy cancellation mark, and average eye appeal due to cancellation. I do not know how this would translate into TPG grade and related value.


The second is a Scott #276 $1 black type 1. Again, very well centered, excellent overall shape, heavy cancellation, and scott number written in pencil on the back (don't know how that impact grade and value).


The third is a Scott #509 in MNH condition. Appears to be very well centered side to side but maybe a bit off top to bottom (grade XF?) Glue appears to be original and undisturbed except for pencil written scott number- don't know how this impacts grade.


The fourth is a Scott #629 MNH in excellent shape. Appears very well if not perfectly centered... need the opinion of pros on this. No visible flaws. Glue is fully intact and appears original. Would this grade 90 or better?
The fifth and last one is a Scott #693 1931 12 cent rotary press printing issue. Appears to be nearly perfectly centered, no flaws (ignore the mark on the perforations on the left side of stamp. That is lint I did not see while taking the photo.) Glue appears original and unblemished... what appears to be a bleed through of the ink from the front.
I welcome all comments and observations. I am just learning.