I don't know about the mark but that is a very pretty dish!!

Pretty glass but it might be pressed glass and not cut glass. The mark may be a mold number.

I bet you're right, Maddielee. I don't know much about glass (obviously), but her other pieces have sharper edges. Thanks!

Your dish reminds me of a pineapple so I looked using that term. I found a similar piece by L. E. Smith. Your mark could be I S

I was going to say it is a pineapple and fan variation, which was popular for quite some time with multiple manufacturers. LE Smith was the first maker that came to mind without any research.

Looks like a celery dish.

Thanks, Murraysmom and Dees. I was thinking the pattern might have something to do with thistles, since my stepmother's parents emigrated from Scotland. But pineapples and fans makes more sense. I'm fairly certain the 5 isn't an S. It's pretty large, and the two straight lines are very straight--quite different from the curved line.

Yes, I thought celery dish too. It's 9.5" long and 4" wide. So nice on the Thanksgiving table.

The cut-glass pieces are beautiful, but when I ran my fingers lightly over the edges I detected chips--at least one on each piece.

Definitely pressed and not cut. tht pattern was made by US Glass about 1885....I don't know that it was copied, but LG Wright bought the molds of lots of other makers patterns. However they seldom marked their pieces....BUT sometimes they did. US Glass did not mark their pieces.
My unsubstantiated guess is that it's an LG Wright copy of the US Glass earlier piece (which was often gold trimmed) made sometime during the 30's or 40's. And properly called a relish dish as celery would have been served in a celery vase, a sort of extra tall goblet.

Since the number is raised, likely, it is the mold cavity number. Mold cavity numbers are cut in the mold cavity and produces a raised detail on the finished part. There may have been multiple cavities in the mold thereby making more than one dish per shot. (Currently, it is common practice to have several cavities for a plastic molded part. If a quality problem occurs in one cavity, the cavity number on the part identifies which cavity is faulty and it may be blocked off and production continued until the mold can be repaired.)

I agree with Linda; I've never seen a piece of glassware with a mold number, even cheap glass.

I am more familiar with molding plastic parts, both thermoplastic and thermoset since have designed these as part of product development, but glassware for table use could be much different, so I defer to Linda. I do know that it costs money to carve the mold to add a numeral detail and that would not have been done unless there was a reason. That number had a function.

I'm guessing it's not a number but an LG for LG Wright.....and the function was to mark the glass.

Don’t suppose you could get a clear photo of the “15” mark? I have a dish very similar to that from MY grandmother, who was born around the same time and in the same area as your stepmother.

I didn't think I'd get anything the camera as it's so hard to see the number without it. I never would have noticed it at all if I hadn't felt it with my fingers when I was washing it. But inspired by Sammy's request, I gave it a shot (literally). The number 1 is more raised than the 5. I took it outdoors and couldn't see a thing, but when I brought the image up on my monitor, there it was. Not perfect, but as legible as we're going to get.

As I said, the number is upside down and backwards. I did the necessary flips in Photoshop, and that image is below the first. It seems odd to have that pointed end of the number 1 on the bottom. Maybe the 5 is supposed to be backwards? Or the 5 is actually a top-heavy 2?

Hmmmmm?