Here is an unusual one i can not find, firstly it rings like a bell for about 11 seconds and secondly the mould looks odd, it's three piece moulded the back section about a third and the front two thirds.
It's also bigger than most i have seen.
In the third picture you can see the back two mould lines.
7 inches in length and 4 1?2 inches in height.
Any thought's welcome regards Chris.