Is the Ivy Leaves Pattern Steuben?

In the June 3 (#2484) Gazette Gazelle Jan Baer saw a mirror black plate from the collection of David Chadwick-Brown. This same plate, in mirror black, with very deep intaglio cutting in ivy leaves (about 1/4″ deep) ” It is now in my parents’ living room.”

in David C-B collection

Jan Baer sends along the 10″ mirror black plate with very deeply cut designs. The leaves have the veins showing in them. It is unsigned. Is this a Steuben piece?

Jan also sends along a picture, starting on the left, a piece signed “Steuben 3314″, at about 14″ diameter. Next is unsigned, but the exact color match for the big (signed) Quezal punch bowl after it. Next is a signed LCT vase that is 11″ high, 8” across.

What Do These Numbers Mean?

Yesterday Lisa Ackerman Baldwin had a question about what the markings are about on a recent basket purchase.

On the bottom someone had at some point written:

My thanks for anyone with a plausible idea. I was going to wash it off first thinking it was A drivers license number or some other writing that detracted from the piece.

Rande Bly responds and suggests:

Total guess: Aurene Cobalt shape 453 8 inch

if the o was an a: Aurene Calcite shape 453 8 inch