You have begun to see the problem that has muddied the water for Verbruggen nuts (afficionados) since Caruana came out with G&B. The most complete job was by Steve Strach. He presents all 3 models of the Verbruggen 3s, all the details on their founding, description of each and photos, and where all remaining originals are today with their histories. It is a great piece of work on the subject and is a must have for anyone interested in the Verbruggens. Fortunately, it is available on line. Just google Verbruggen 3 pound cannon and look around. I can also provide a printed copy which is much handier to work with. De Beers and Jackson came out with their book which has a good history of the Verbruggens and after Jackson died Carel came out with a second edition which was greatly improved and the Verbruggen prints were in color. If you have a copy of the 2nd edition in color, careful with it. They are selling on line for over $500.00. I got mine several years ago still in shrink wrap for $65. The first edition is still available for about $35. De Beers and Jackson were apparently confused by Caruara's book because of his confusion with the Townsend. Strach got all three models but got the two 1775 guns, the Pattison and the Townsend, mixed up, probably because of the poor photos and screwy measurements he got from Canada. Most of the other photos in his book he took himself. He even has the transcript of the original letter from 1775 that gives the length of the Townsend as 2'8". That's the breech to muzzle length, the tip to tip is 35" which he has listed for the Smithsonian and the West Point guns. Why he said they were Pattisons is a puzzle but the Canadian contributor said the length of the Perth 1775 gun, the only Pattison, was 38". That gun is actually 36", breech to muzzle or 40 1/2" tip to tip, just like the 1776 Congreve, which accompanies it at the Perth courthouse. There are other details which were missed and that led to all the confusion. BC