From Little Gun:
http://www.littlegun.be/arme%20belge/artisans%20identifies%20d/a%20drissen%20gb.htm

Quote:
"Ferdinand DRISSEN was registered with the bench of tests of Liege of 1874 to 1900. In 1900 its activities were taken again by BERNARD E & Co"

"FD in a rhombus lying which is the mark of Fernand DRIESEN (Proof house of Liège 1874/1900).
Its company will be taken again by BERNARD E & Co street Mont St Martin in Liege in 1900 and this one will keep the mark of DRIESEN while adding seems it a crown to it"

So Drissen most likely did not make the tubes on a 1913 gun.

But you are correct Drew. The name of the damascus pattern has no bearing on the country of origin. I should never speculate when it comes to damascus...

Pete