All About Pocket Knives

I have come across a few Schrade Walden knives with this shield. Does this shield represent any specific time period. Was it used only on certain models. If anyone could share any knowledge on this subject I would greatly appreciate it. I find myself paying a little extra attention to knives with this shield lately. thanks

Nick - here is a link to a thread with some discussion of shields in question.
viewtopic.php?f=64&t=58475&p=668988&hil ... ld#p668988

Thanks Mel, knew it had to be here somewhere.