These appear to have been only lightly used based on the heel wear. They are marked 11.5 D however I believe that Gucci fit about a half size lower so they should fit 10.5 to 11. The insole measures 11.25" in length and about 3 1/2" in width. The outsole measures 11 7/8" in length and 3 7/8" wide. I wear an 11 1/2 and these are too small.I would say these are in excellent used condition with the original soles and heels. Please note the stitching on the right shoe (see photo).
I don't know if there was a repair or a manufacturing flaw. The item "VINTAGE GUCCI DARK BROWN HORSEBIT LOAFERS" is in sale since Sunday, February 16, 2020. This item is in the category "Clothing, Shoes & Accessories\Men\Men's Shoes\Dress Shoes".The seller is "ardegen" and is located in Phoenixville, Pennsylvania. This item can be shipped worldwide.