Scott # J29?

first time I.D.ing these postage due stamps...thought I had a J29 but not sure if it's really a later issue, J59?

I'm having a hard time distinguishing the difference.

...also, if these (or any others in the album)are valuable, should these be removed or would an auction or collector prefer the whole page.
this is from the 1924 album....would I cut the page out(gulp)...I love antiques and it pains me to disturb the collection like that but I don't want to damage the stamps that I need to sell.

If I soak them (which I've never done ...yet) that particular page has a collection of cut squares on the back.

I need guidance!...I don't want to make a silly mistake out of impatience and ignorance! help!

If you absolutely MUST remove them and if they are used examples then soak in a container (large enough to fit page without creasing or folding them) in warm water but if you do that then you lose the information and documentation associated with them. For instance the Scott numbers and weather or not they are the single line or double line watermark variates and the color differences. I wouldn't remove them unless you thoroughly document them down to the last detail- but that is just my opinion.
EDIT:
Also, I forgot to mention that after you soak them and the come loose from the paper you must dry them in a drying book or reasonable fashion like in a heavy book on a paper towel or piece of blotter paper (I use water color paper) then after they are all completely dry and pressed flat you may re organize them and store them in a stock book or glassine envelopes.