palace pier original Vintage theatre Ad Poster from the 1930's

This is a palace pier original Vintage theatre  Ad Poster from the 1930's in its original frame and with original glass. This add poster is for a play called MURDER ON THE SECOND FLOOR by Frank Vosper which was held on September 22nd, 1930. This poster even states that "The king and queen heartily enjoyed this comedy". I own this item as it was passed down to me by relatives. I have decided to sell this item because i feel its value to a collector or other persons would be greater and more fitting than me keeping it cupboard under the stairs were it cannot be seen or even appreciated by others. I would like to know the value of it before i sell it i also have another just like this but advertising a diffrent show. thanks in advance.

Fair