Poppy

Out digging in the garden today and unearthed this coin. Quite badly eroded, but it appears to be george III. We have been looking and found coins which seem to match, but for the arched lettering underneath the head. We cant find any images of similar coins with the letters underneath. Just curious as to what this coin might be so we can appreciate our little bit of history in our small Northern Ireland back garden!!! All help greatly appreciated! Unfortunately pics too big to upload, so link below. Thanks!!!! www.photobucket.com/whatsthatcoin