I bought a Dickson about five years ago. It came through Graham McKinley as well. He has re-finished the gun and it looked spectacular. It was a 1943 gun with 28" barrels. Had original case with original owners initials in the oval and on the case.
I paid $12,500 for that one.
I recently bought my friends Dickson. It is a 1909 with 29" barrels. It also came through Graham. Paid $10,700 for it.
Both guns are truly the "Best" quality.

Mike Proctor