pbr A metal-detecting enthusiast who unearthed one of Britain`s most significant Iron Age hoards is celebrating another valuable find.br ppbr David Crisp discovered a medieval seal dating back 800 years in a field in Stirlingshire.br ppbr The well-preserved silver antique, decorated with a small stone carving or "intaglio" from Roman times, could be worth several thousands.br ppbr Safari park keeper Mr Crisp made the find less than a year after his hobby led him to four 2,000-year-old gold neckbands or "torcs".br ppbr Described as one of the most important hoards of Iron Age Britain, the father-of-one is still waiting to find out what reward he will get for handing over the treasure.br ppbr He said Scotland`s Treasure Trove unit, which is responsible for archaeological finds, was delighted to hear about his latest success.