Vintage "Shanghai" brand tremolo harmonica. This type of harmonica is known for its full-bodied sound, achieved by using two reeds per note tuned slightly apart to create a vibrating or tremolo effect.
* The model is likely a tremolo harmonica, often used for folk, gospel, and ballad music.
* It typically features a metal cover plate and a comb, which is likely made of wood or plastic, with 24 double holes and 48 reeds.
* The key is likely C, which is a common key for beginner instruments. 7inches long.