A number tag from the dining room chairs (or cabin berths) on board the Queen Mary.  This was purchased from a couple who bought a lot of items at the Queen Mary sales in the early 1970s.  I have put them on all of my Queen Mary dining room chairs and am now selling the extras.  If you own any dining room chairs from the Queen Mary, these will be the cherry on top since the vast majority of chairs don't have these any more.  Measures about 7/8" x .25"