The book is "Gunmarks"by David Byron. I doesn't go into any detail on any of the proof or trademarks in the book. Just a diagram and one sentence for each. It has three versions of the Webley winged bullet. The cavity back one you have with trade and mark on either side and W&S below. One with more upright wings with a wide groove just back from the round nose which makes it look almost like a shotgun slug. It just has W&S below. The third is round nose bullet with several grease grooves and no letters. There is also the London Tower trade mark, the Webley in an oval, and the hand cuffed hands with Webleys above and M.R. below.
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