It should be noted that ancient "Zanzibar Doors" used to be found very frequently in old Omani houses and forts. See e.g. the article in Tribute to Oman 1994 "inside the walls" that discusses Muscat. The traditional large Omani ships (dhows) included many beautiful wood carvings similar / identical to that found on "Zanzibar" doors, hence these doors are as much part of Oman as Zanzibar.
Unfortunately many doors in Oman and Muscat in particular have disappeared into thin air over the past four decades. Magnificent examples of these types of doors that disappeared are the doors of the old souq in Nizwa and those of the old Palace in Muscat. The fort of Al Hazm still has magnificent carved doors, if they are still there and not replaced by poor fake new ones.Similar fine woodcarving is also found on the best and genuine antique so called “Malabar style" Omani wedding chests (Mandus). See our "Wood" section