Advice needed

  1. 26,813 Posts.
    lightbulb Created with Sketch. 21
    I Found this antique Thermos Flask while digging in the garden today but I'm having a hell of a problem trying to get the lid off any ideas folks?
    I have been hammering it for 30 minutes ?
    https://hotcopper.com.au/data/attachments/5529/5529930-482882e4e1d0d8b77c530d2653b6ae16.jpg
 
arrow-down-2 Created with Sketch. arrow-down-2 Created with Sketch.