This afternoon running a shopping errand two towns away: Country Squire Old Toby in an Erica Second (Peterson) which I originally thought was intended to be a Deluxe 307 because it is 6.25 inches long from bowl to button.... but the bowl is too short...its only 2" and the chamber is 20mmx40mm .... so having read some articles by Mark Irwin I have determined (until corrected) that it is was intended to be an old style Deluxe 312... because it has chubby cheeks and is 1-2mm taller than current 312s. He points out that old style were taller by 1-2mm. A very enjoyable long smoke, about 2 hours with one re-light between stores.