Wow! the hole diameter is an inch and one half wide? I would love to see a picture of the top of the pipe. You have one of the shorter bowl height variety, I love the stamping!
Doc
Uh oh...
Condition is an issue, then. Sounds like the chamber walls were deeply charred and then then sanded down to healthy wood. The largest diameter chamber Dunhill used for any standard-sized pipe that I've ever seen (or heard about) was .88"