Your ladle was an interesting study.
It was made in Canada as the marking states in English "sterling" which was a designation for 925 (sterling quality) used by many Ameriican (after mid 19thC) and Canadian silversmiths (much earlier). Since 1556 in Edinburgh and 1681 in Glasgow the marks designating 925 or better 950 silver have been symbols, not the word "sterling." These two cities along with the Scottish provinces, did not use the word "sterling."
The style of the ladle shows a French influence as well in its flowing lines and bowl lip decoration. There were many French Canadians living in Canada at the time your ancestor was there.
Without initials, the Canadian silversmith is very difficult to determine.
My best thought is that it was made by one of the many European immigrants to Canada during the 18th and early 19thC.
One such maker was ***** ***** who was born and apprenticed in Edinburgh but lived and worked in Canada 1813-1835. He used a man's head with the word "sterling" in his marking. I found that he also often used his initials AR along with a man's head and "sterling" so I cannot say it was positively he that made it.
There were no standard regulations on the quality of silver in Canada during the period your ancestor would have been there. It was a matter of pride and marketing that the word "sterling" appeared. The standardized regulations came later to Canada as they did in USA.
There were also few "pattern" names at this time. Each piece was made by hand. Something like a soup ladle would have been its own unique design.
In conclusion, I determined that your soup ladle is late 18th/early 19thC Canadian made sterling silver.
Its current retail antiques store value would be $2600-2900 assuming excellent condition.
A private seller to a dealer can expect 30-60% of retail value.
I hope I have helped you.
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