I donīt remember if the stamp is F or Ģ stamped. What you suggest ?
To summarize, this is where we are: you want more information about a stamp for which you can offer no link, no picture, no description, no color, no perforation, no shape, and no currency, only that you think it was a Great Britain issue, and you think it was 2― of some currency, but you don't know which. So, with all due respect, you're kind of wasting everyone's time right now, including your own.
Everyone on this forum has good intentions, most are willing to help to the best of their abilities, and some people on this forum have world-class resources and knowledge. Respect them all by putting forth at least a little effort yourself, first. Give us something
to work with, and no doubt you'll have an answer in a few minutes.