"When was my SE bike built, and how much is it worth?" - Our records don't date back to the '80s or '90s. If you want the best guess/estimate of the year of production, you can hunt around on such sites as bmxmuseum.com, bmxsociety.com and vintagebmx.com. You can post photos of your bike there and ask around in the forums. As far as how much your bike is worth – it’s worth whatever someone is willing to pay. Explore the websites listed above and you may find somebody who is looking for the exact bike that you have.