.5 Liter Lidded Stoneware Stein; Cobalt Art Nouveau: Marzi & Remy?

It's gonna be eBay-listed soon, an' I'd like to offer a reasonably accurate description. The blue is vivid, deep an' rich, with a notable 'bloom' on the stoneware around the circles an' diamond pattern. Not a crack, chip or other sign of use...except that the hinge seems to have quite a bit of play, whether from wear or as-made. Squeaky clean inside an' out. Aside from the capacity, the only mark is on the bottom: 2305.
Are any of y'all stein collectors? Thanks for lookin'!

 

This site shows it as Marzi & Remy.

Here's one showing Marzi & Remy's mark.

Here's a catalog page showing your stein, top row.

 

I see nothing Art Nouveau here.

 

Thanks...all three confirm the pattern, colors, an' etc.
The first one says this:
Catalog No. 2305
Stoneware, threaded relief, 0.5L, pewter lid.
Price Range: $100-$150
What is the meaning, in context, of threaded relief?
Also, mine doesn't bear any mark save the 2305 pattern; is it common to have one of their steins without a makers mark? If not, is mine a knock-off?