Stan Smith's come in a sturdy retail box, make sure the lid folds back into the box and is attached with two small glued down tabs.
Stan Smith's come with high quality flat woven laces. Make sure the lace tips are tightly sealed with a plastic cap. Make sure the weave is tight and even.
Make sure the back of each eyelet has a metal outer and inner ring. Take note of how the last eyelet is punched through the thick lining of the collar area.
Stan Smith's have an Adidas logo embossed into the midsole. Check that the letters have a slightly rounded edge and that the registered R is sharp and clear.
Get a detailed guide on spotting fake Stan Smiths from goVerify.it here bit.ly/1NnKYuv