What does the "Group Number" on Dunhill Shell Briar Pipes mean?

[droy1958]

Are they on ebay?

Yes...

droy19580209 | eBay

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Also - I see where these go up to at least a Group 6, not just 5 like I previously stated. I tend to not look into this brand too much because I'm in love with their Cumberland, County, and Shell Briar models and the more I look the more I want to buy one and buying one would get me in HUGE trouble!

I seen one today that was a Group 6....