I love Sabah Babas. They are amazing shoes and I wear them all the time and they have a great story. I was so excited to find this rare blue color in what I thought was my size. Unfortunately, these are not the El Paso Babas - these are the Turkish ones so a size 37 is a size 5 - 5.5 and the seller was confused and listed them as a 6.5. My loss is your gain. These are great gifts. These do have a small "B" in blue ink on the inside. I didn't try hairspray or Ammodex or any of my usual tricks to get this off but it will probably come off. Retailed for $190. Brand new, never worn. • These are handmade so there are variances in the leather, sole, and they are not imperfections. I wish all shoes had this organic look :-) • As mentioned, pen mark "B" inside; you can see in pics • Marked a size 37. THIS IS A SIZE 5 or 5.5. I am a 6 or 6.5 in mules (like the Gucci Princetown) and these fit me like the 35 does in those. Measurements below. • Approximately 9 in / 22.8 cm inside shoe from tip of toes to back heel • 9 1/4 in / 23.5 cm from top of toes to back of heel down center (bottom of sole) • 3 in / 7.5 cm across sole at widest point (bottom of sole) • 1/4 in / .5 cm sole • Although you may reach out to me anytime, please ask any important questions before purchasing as I do not accept returns. Thank you