If you have Googled, I take it you know this held a Californian wine? Almaden Vineyards were founded by a Frenchman in 1852 in the Almaden Valley in San Jose. They used those flask bottles for a number of wines. This one (with a handle) was for their California “Mountain White” Chablis:
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Only the fancy leatherwork was imported from Italy and, I believe, assembled around the filled bottle on site. They’re still in business, although now in the San Joaquín Valley. If you drop them a line (website link below), I expect they could tell you exactly what this particular container was used for (probably "tourist trade" or limited edition or something of that kind), and give you a date.
https://www.almaden.com/
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www.almaden.com