That is typical of how Compass Lake Engineering stamps their barrels. 1-7 for the twist rate and 11-03 is the date.
CLE doesn't make blanks, they are a custom barrelsmith that finish machines blanks into finished barrels. Accuracy is going to depend somewhat on what blank was used but they don't generally use poor quality blanks and the machine work, crown, chambering etc is almost certain to be immaculately done.
It's been around a while so who knows how many rounds it's fired.