May I be so bold as to suggest you might get an answer quicker if you provided a little more information?
A picture of the tray would be useful. Your own observations about material used, size and where you acquired it should not be discounted completely.
You see, generally the last thing anybody evaluating sliver does is look at the mark. Indeed it is usually used just to confirm observable data.
I take it you denied yourself the opportunity to read any of the thousands of other posts on this forum many of which say basically the same thing: post the entire picture and tell us what you know yourself from common sense observations.
All you show is a crown which is probably a trademark not a hallmark and four gothic letters the first two of which are legible and the last two of which each could be one of four gothic letters because they are worn or badly stamped.
You could even tell us what you deduce the four gothic letters were. The first is S the second is G and the next two are…?
Or you could go do what you are asking this forum to do, which is use AI to search every single last century silver plate maker using four gothic letters the first two of which are S and G as a trade mark.
A task which has more to do with memory test and eye strain than knowledge about silver.
CRWW
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Sorry, I didn’t intend to insult you. The trays were donated to the Settlement Home for children which will be sold in our annual garage sale. Proceeds support the children’s home in Texas. I’m just a volunteer for the organization and we try to identify and price donated items for the annual sale.
I’ll post a photo of the tray.
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This is a tough one. I can at least tell you what it’s not, at least as a starting point. It’s not sterling silver from the U.K. (those aren’t proper British silver hallmarks), and not sterling silver from North America (sterling from Canada, the U.S., or Mexico would be clearly marked, “STERLING.”). The marks don’t look like any of the standard silver markings from continental Europe, either.
So, probably just electroplate, which contains virtually no precious metal - decorative value only. But from where, and when, I can’t say - the marks don’t look familiar, and some quick searching hasn’t coughed up any likely suspects. Difficult, because there were hundreds, or even thousands, of makers of decorative electroplate, and the marking was almost completely unregulated. A bit of a free-for-all. 
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Looks to be in excellent condition. Take a look at the “sold” listings on eBay for silverplate serving tray. The values vary a lot, but rarely top $100. The ones that bring the highest prices seem to be the largest, and are often clearly labeled by one of the better-known makers. Most sell for something in the $50 range.
Without unnecessary speculation and waffling:
GOLDFEDER SILVERWARE COMPANY INC - Yalesville CT
Established in 1932. Succeeded by Birmingham Silver Co.
It’s American electroplate, not silver. See the link below for Goldfeder Silverware Co
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Beat me to it, Bart!
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I learn from the best!
A recent sale of something similar, from the same maker:
https://www.ebay.com/itm/318255347790
Click “see original listing” on that page for more info.
ETA: Too bad it’s not sterling. This massive one that sold on eBay, had it been sterling, would have had a melt value well north of $10k. 
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Indeed, a task for me. No knowledge, just eyes… Ah, these ubiquitous allusions…
Meanwhile in Poland…