I don't know if you ever received a definitive answer on this one but I can say for certain what you have.
Gillette Tech Ball End from 1969, Produced in the First Quarter of the Year. I have several of these razors myself but have not seen this particular handle knurl design. It's quite lovely and you got yourself a great deal at that price its worth twice that. If you are ever interested on parting with it please let me know.
Take Care,
