Salvatore Ferragamo mules kitten heels 5 5.5 vintage

Cute vintage mules by Ferragamo They didn't store well. Paint is peeling and could use a visit to the cobbler. They can still be worn as is, the peeling paint is on the underside. I am guessing size 5. The code is visible but faded due to lotion and rubbing. I can make out DQ91479.