Doctor Strange 1st series 1968, issue 173 Graded Very Good by Lone Star Comics, but please judge condition for yourself from photos.

Cover art by Dan Adkins. While a World Waits!, script by Roy Thomas, pencils by Gene Colan, inks by Tom Palmer; Umar frees Strange, via suggestion from Clea and Victoria Bentley; Dormammu defeated by his own vow never to enter the Earth dimension; curse returns him to the Dark Dimension