Want this question answered?
Only meothod I've found is to look in the used value books that have pictures of the gun you are looking for. Match the gun with the picture and description and the model number will be shown right there. Sometimes it takes a lot of looking.
Sweeney Todd was barber, and barbers of his time used straight razors. Because of the nature of the razor he used to regularly shave clients, it made the perfect tool to cut the throats of his customers. So he would slit the throats of unsuspecting customers with his straight razor and then send their corpses through a trap door into the basement. From there, Mrs. Lovett would grind up their meat and serve it in her meat pies.