ROK Dark Cloud Wash Slim Fit Straight Leg Moto Exposed Zipper Ribbed Jeans
Men's Size 40x32 Actual waist measures 33.5" and actual inseam 31.5" 
Zipper is for decoration only. 
Waist and length measure a little short, but fabric has a lot of stretch)
I think these are vintage, made in PRC

Approximate measurements with garment laying flat:
Waist: 19.75 inches 
Inseam: 31.5 inches 
Rise:  11 inches
Leg Opening: 7.5"