Silver Plate Lemon squeezer for Bar.  That is what I think it is.  Sitting on your bar will get lots of interest anyway.  Definitely a conversation piece.  No marks.  The round perforated plate is stainless steel.  No Maker's Marks.  Also could be used for the table with a plate of lemons for guests to use for their prawns, etc.  Vintage.  Length 20cm & height 5cm.  Working Condition.  (Have made no attempt to clean for photos but does polish up beautifully.)