Doulton
The Doulton logo
I spotted this on an old piece of drainage pipe and could not resist bringing it home to scan. As you can see it's a very clear, even impression, probably the best I'm going to see.
The centre logo contains the 4 D's back to back to form this funny flower symbol and until I had seen a clear print on a Shackle insulator I could not work out what is represented.
