good to know you are pleased with your yb,s Frank and are taking notice that some of the old strains which are all around our area are as good as you can get.With regard to the Mcivor grizzles i was a good friend of Peter Mcivor and went visiting lofts in the Solway and other places and got pigeons from him in the sixties and early seveties and the grizzles he had then originated from Berry a publican from Larkhall and he told me they were "Mason 12s", some of the older Larkhall members will probably know more about this, the pub was well known as Berries and may still be there