Frye womens  Harness boots  12 R  Us size 8.5 , looks like its 6.5 UK and a 39 in Euro

Very strong thick leather well made boot for biking or riding,  or just wearing , old fashioned civil war riding boot is the history of the design i think , made by Americas oldest bootmaker.

Good description of them here -     https://www.thefryecompany.com/products/harness-12r-womens?variant=42307169091775