I have a few Philippine stamps that I am unable to find in the Scott catalog
I found #1 pic in the cat, it is referred to as R1, yet no listing refers to R1 specifically, only R1(a) etc, but only for overprints.
#2 looks like an R1 as well.
I found nothing on 3,4
#5 has "comunicationes" on top
#3 has Comunicacions on top also. #5 looks like a stamp cut out of Postal Stationary.
The Comunicacions stamps are probably revenues or non-postal stamps and will not be in Scotts.