This feature would be very useful for identifying damaged coins if implemented as the Weight and Size fields. I mean, allow the user to search for a thickness range.
Use case: I have a damaged Macedonian coin that I cannot see many details on. However, I can easily measure it with a caliper or a ruler. If I have the size/diameter, thickness, and weight (for which I can take advantage of the range feature), it becomes pretty easy to spot the coin. Even if I don't know the country, these 3 measures would emilitate thousents coins from the list. And if you have any small pieces for another search criterion, such as some number, text fragment, etc, probably the coin would be almost unique in the search result.
Also, adding the Edge style as a search criterion could be very useful for this use case.
I hope my use case is helpful.