The "rarest" this perf 10 coil could be is Scott 456 which has a catalog value of $170 used if centered VF. A scan of the back would be helpful to look for setoff.
A watermark will not indicate a valuable stamp. You should check for one but what you really need to do is go to the Stamp Smarter link given above and do some research first. Go to Stamp Smarter.
Thanks, will do. Once I received this book of world stamps I thought it would be interesting to see if a little gem was hiding in amongst the rough. I appreciate any info from all on this site as I've had little help or interest here in the UK
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