US Stamps Values For Special Ones

Hello everybody

I need help how to use Scott catalogue for some special items.

I had a new collection of US stamps. I had many (like thousands of) with one side or two sides without perforation. I see some coil stamps in the Scott catalogue but I think it was not a exact match.
I also have some error items.
How can I find correct pricing for them?

For example what are the prices for these examples?

Thanks in advance...

2 Cents perforation: 10
1 Cent perforation: 12

What error are you seeing? Maybe you should read this post by John Becker: https://goscf.com/t/89768#832979.

Did you check whether your '2 Cents' could be Scott #599? If so, why was it not?

And did you consider looking at the bottom pair frrom a booklet pane for the "1 Cent" stamp?

"Natural" straight edges mean different things in identifying U.S. stamps, as opposed to later damage by scissors.

The first is a coil format evident by the straight edges on opposite sides. It is Scott 599. The slitting (cutting) is poorly aligned, but within production tolerance and not shifted by enough to be an "error". Worth less than $1.

I agree fully with NSK, the second is a pair from the bottom of a booklet pane. It is Scott 405. Completely normal, and not an error in any sense. Again, very modest value.

From my experience and observation, coils (resulting in a roll with only a few outer stamps visible) and booklets (which are sandwiched between cardstock covers) ... both formats make it more difficult to inspect the near-finished and finished product as the stamps are essentially hidden. The sheet format is more easily inspected in the final production and retail sales stages. The result is that the quality of coil and booklet stamps is somewhat less.

The third is a poorly cut stamp as the press sheet was cut in half into 2 panes as discussed in the link provided by NSK. It is Scott 114. The extra stamp portion to the left is interesting to some specialists, but the scissor damage to the lower left reduces its monetary value greatly.

The 114 also appears to have suffered an attempt at removing the pen cancel.