Hi Glen: Sorry for taking so long to reply to your request for my data. I don't have as much serial data as you might hope for. The only data I have accumulated is on the Sovereign and Olympus, and it's not that much. Over the years I have owned many Sovereign I/Sovereign II and Olympus/Apollo pairs and I have kept serial data on the systems and all of their components, and have included some data on other systems that I did not own. On these models there is definately a correlation between the cabinet serial numbers and the internal components and conclusions on date of manufacture/sale can be made. You are welcome to any data that I have. I can get it to you on an Excel Spreadsheet. Just let me know. Rick