You never know what you might come across at an auction of house contents. Which is why they are brimful of interest. This copper deep sea divers helmet with the insignia of the US Navy Mark V full size is one of the more unusual collectibles at Matthews sale of contents of Rath House, Dundalk on March 20. There are 1,117 lots including antiques, art, silver and collectibles. The helmet is lot 47 and is estimated at just 120-180.