A long shot, but, help to identify this piece of bottle.
Can anyone here help with this please.
This was found in Shakespeare Bay, adjacent to Picton, in the north of the South Island of New Zealand.
The bay has a long history of whaling and the beach where I found this was definitely used for careening vessels as I have often found pieces of discarded copper amongst the stone.
Hopefully the attached photos can give some a clue as to the origin and/or age of this bottle base.
It is obviously in very poor condition as it has spent a long time underwater.
It is a dark green glass, very thick and very heavy and an irregular thickness.
The inside has a mark on the glass and indentation which looks like it could be from manufacture.
The mark on the bottom will hopefully give someone a clue to its origins.
Thank you in advance for your help.