I have no idea where/when they are from. Picked them up at a Goodwill in a military town. The size tag inside doesn't have a model number—just says Made in Korea. I hadn't even noticed the toebox perforations were different. Very strange!
I've got what appears to be a brand new pair. I haven't been able to find any info on em either. The toebox has a bit different shape, and there's no branding in the straps. There is, however, branding on the heel.