I'm trying to identify/value an old amphora. It's quite special because it's still sealed and you can hear the contents sloshing about inside. It has the word SECUBO engraved across the front, and there is a symbol on the bottom. I believe it was found in Dunfermline, Scotland.
I was wondering if these are very common, either sealed, empty or otherwise?
Any help would be much appreciated, especially if you can identify the symbol on the bottom.
There is a link to a picture below.
Here is a link that might be useful: