Sorry the pictures don't seem to store and transfer as well as I had hoped. The only number I have found is "18.4". There are a number of letters and symbols which I think can all be seen on the photos, especially if you click on the photo and look at a larger version. The shotgun is 12 gauge, but I have not actually measured the muzzle diameter with a micrometer. Based on the pattern shot, it must be about cylinder bore. Any pattern beyond 25 yards is extremely open with any loads I used.
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