Hi can anyone help with this? Silver disc embedded in the bottom of a silver dish with wooden bottom - anyone throw any light on the mark and also the purpose of the dish? Given wooden bottom would suggest for 
As you don’t show a picture of the whole dish I can only speculate that it could be a bottle coaster. The form of a metal/silver rim with a wooden base and felt underneath to prevent scratching a polished table, together with a central disk to engrave your family armorial is typical of such a coaster.
You may be able to find a family name to go with the armorial by looking through “Fairbairn’s Crests”, several freely-browsable copies of which can be found by searching the net. Note that it also comes in different editions so you may have to search more than one volume.
Phil