The 1899 Parker catalog shows Quality PH with 'Fine English Twist' barrels, which is what those appear to be. I'd be even more cautious regarding load choice.
Neat legacy hankyorke-let us know what part of the country you're from and we might be able to recomend a doublegun specialist smith near you for a good check and clean as David mentioned.

Last edited by revdocdrew; 10/13/07 11:29 PM.