Is there any definitive sources available concerning model numbers and approximate dates of production concerning Interarms imported revolvers? For whatever reason, they interest me quite a bit, and there are several models on my short list that I'd like to acquire over time. But would love to learn about that time period in Rossi's existence, including other models produced for other countries/importers around that same time frame. Thanks. I currently have a 3" M720, and a 4" M511. Looking at a 6" M713 currently. Short list includes a 4" M851, and a 6" M971/972. Would love a target style 6" .38 or .32...I know there some produced, but I have exhausted the Google search on those other than a mention here or there in various forums...