I don't know how generally known this is but here's a nice little identification chart for Gillette razors. It's helping me a bunch. http://www.razorarchive.com/gillette.pdf
That's a great resource, I never saw that before! Pretty handy! Here are some other good online Gillette info sources: http://wiki.badgerandblade.com/US_Gillette_Dating_Information http://www.renaldo.us/grbd.php
Here are some more. http://www.razorarchive.com http://safetyrazors.net/gil_ser2.htm http://www.mr-razor.com/Rasierer/Gillette Rasierer.htm