I’d say PW 14 is glossy, PW 17 is semi-matt (“lustré”), and PW 15 is matt :P
But the base colour of PW 17 is ivory… not chamois :P
So at least what’s referred to here in England as “semi-matt” is actually PW-15. I reckon PW-17 would then be called “Lustre” (without the accent :) ).
Although Silverprint claims that Forte “only produces one version of matt”... Hmm. Hmm?
Simon