The D-shaped comb has been carved from dark wood and is from Persia (Iran).
It is carved on both sides in Arabic script, thereby giving the comb a protective, talismanic quality for the wearer. Indeed, such a comb was to be worn as an ornament rather than used to comb one’s hair.
A related example is illustrated in van Cutsem (2005, p,. 83).
The example here is well carved and is in excellent condition.
References
Cruse, J., The Comb: Its History and Development, Robert Hale Ltd, 2007.
van Cutsem, A., A World of Head Ornaments: Africa, Asia Oceania, America, Skira, 2005.