A collector told me that in stock book are common stamps (except a few stamps) and I try to have a new opinion.
I like your attitude.
One has to be cognisant of the term "common stamps" if meant in a derogatory vein, then dismiss the person, we have no time for them.
If, however it is used to adjust a persons opinion as to value of a collection,
then, albeit harsh, it needs to be said.
Many see the dollar signs, not the stamps.
I think your collection has promise, some beautiful stamps, and mouth watering postmarks. A lifetime's work awaits you.
I was drawn to this beautiful Pmk... lovely!
This is the finished product ....My Cuba 1888