It is not a currently listed Brunk counterstamp, but from the design of the mark it appears to be a silversmith's mark, would be worth researching
Why is it a "shame" ? I'd rather have that coin with the counter-stamp than a similar-grade coin without it. The counter-stamp makes it more interesting, I think.
Great piece; love the early date. If you remove the coin from the holder and take more pics could we see a picture of the coin at an angle? Looks like a deep stamp with a good quality die used.
Thanks for the reply's. I'll try to get a better picture up soon. It is a great strike and the coin looks just as good.