Hi,
Sorry for the delay in responding. I am still searching on this one unfortunately. Although, there is a pair or pears listed on OZ ebay at the moment which I believe have been made by the same company as these ones listed here. 3 weeks left of study and I will be able to dig a bit deeper through my links.
I am wondering if these could have been made in Eastern Europe around the 60's era?! Possibly Romanian? Czech?