GB 1972 Sg904 Etc British Architecture

Hi, I have this set of which the 3p 4p 9p have borders with printing errors. The 5p and 7 1/2p do not have borders and appear to be correct. Are these know errors and if so are they rare stamps? Any idea of values?

Thanks in advance for any help.

Are you referring to the selvedge? What is in the selvedge is not the stamp. So a white area in he printing on the selvedge does not make an error on the stamp, rare or not. At best it is a nice part of the selvedge.

If you have a 3p, 4p, and 9p with such errors, the odds are they are normal. It would make a positional stamp. But the imprinted "T" of 'TOTAL SHEET VALUE' already would identify the position.