When was the 'Nutshell' Pub in Bury St. Edmunds Built?

I'm researching the History of The Nutshell Pub in Bury St Edmunds.

Do you know when it was built?
Who built it?
Was it always a pub?
Does the pub sign have any relevance?

Thankyou in advance for helping me!

http://www.thenutshellpub.co.uk/pub-history.html