Great Britain King George V Half stamp during the war

Ok sweet Thanks heaps!

With the German Occupation of the Channel Islands 1940-1945 mail out of the islands was very limited but local mail services quickly ran out of stamps . To make the penny rate there were 2d stamps which did not serve a local rate so these are known bisected to make local rate.

Check for “Channel Islands bisect” on eBay you will find a couple of dozen at any one time.
Most are philatelic , obviously only collected on cover or authentic piece, relatively common , certainly not scarce, you will find entire covers or cards for £20- £30 with some hopefully priced at £100 , though you would be daft or desperate to pay that much.

Your piece would be at the lower end price wise as it has a messy indistinct cancel but the sender address and signature does help improve it 

* by the way decentguy , there is an “edit” option which would have allowed you correct any typo in your first post instead of taking up space and posting the whole thing again. Please use it in future,  saves clutter!