Hello and Welcome,My name is***** am a Personal Property Appraiser and would be happy to assist you with your question.
Your vintage jug would have been produced by Thorley's of Staffordshire who operated out of Longton, Stoke on Trent.
The Fat boy jugs were produced in the mid 20th century circa late 1940's to 1960's.
In excellent condition your fat boy bone china jug would have a retail value of 25-35GBP.
If there are any cracks chips or damage, this would detract from the resale value.
I hope this information was helpful to you today,Best of luck with your vintage Fat Boy Jug,Any feedback you can leave for my service would be much appreciated,Thank You,FrankPlease let me know if you have any difficulties with our rating system.