Here is a CD 147 that is unlisted in the guide. This is an other patent no name spiral groove that was made by Hemingray. Normally these are common as mud but this one I have never encountered before, in the patent date of 1907,you can see where the 0 was embossed over top of a 9,the loop in the 9 is seen inside the middle of the 0.If they had not overembossed it the date would have read 1997.Wish I could find one like that! I have another closeup of the embossing if anyone needs it. Insulator is squeaky clean, just having come out of an acid bath, dome embossed 21 and VVNM condition, not one nibble or flake that I can see on the spiral groove at all! $4 + $5.70 shipping.