Hi,
Managed to find this Reply from Canon to someone that had sent them an E-Mail about this.
Feb 14, 2011; 10:40 a.m.
Canon has stopped date coding / date stamping lenses !
Here is a response from Canon I sent as I have just got a 70-200 2.8 with no date code . I bought Feb 2011
Thank you for contacting Canon product support regarding your EF
70-200mm f/2.8L IS II USM. We value you as a Canon customer and
appreciate the opportunity to assist you.
Canon has stopped putting a date stamp on new lenses. I apologize for
any confusion this may have caused. You will know if you have a
refurbished unit by the appearance of a tiny center punch divot next to
the serial number. If there is no such mark on your lens, then you do
not have a refurbished unit.
Hope this will help other people as well as me.
Regards.
Please let us know if we can be of any further assistance with your EF
70-200mm f/2.8L IS II USM.