This is a list of websites that may help in your research. I will add new ones as I find them. If you know of one not listed here, please let me know and I will add it.
Keep in mind that manuscripts are not just for people who make scrolls - they might contain a drawing of what you are looking for.
If any of these links don't work for you, try putting them in The Wayback Machine at archive.org
Colchester Treasure Hunting and Metal Detecting
Metal detecting holidays & finds database
Norfolk Metal Detecting Tours
Weekend Wanderers Metal Detecting Club
Images of their finds
Metal weights and measures