I believe these to be very rare, I cannot find any other pair with this pocket online. They are a 600 series with a talon 42 zipper putting them in the era of late 1960's through the 1970's.
They are in great shape for their age, there is a little discoloration along the creases from years of washing and ironing them. They have the white Levi label that is associated with the 600 series during the late 60-70's. Please see photos for all measurements. The original size and care tag is intact, but severely faded. I can make out the size and care instructions, but barely.