Had this for rather a long time, and never been able to identify it.  13 cm tall to top of stopper, which has a cork inside it.  7 cm across the base.  Mark underneath is under glaze and is blue.  Condition is very good.

Without a picture, I am afraid we cannot be of any help.

Sorry, will try to load pictures again.

I think that is the Fürstenberg mark, a porcelain manufacturer in Lower Saxony, Germany. But contact C.S. Marshall at Porcelain Marks & More to confirm this.

It is definately one of the Fürstenberg marks, these were often used as a tea caddy