Postby JayT » Fri Apr 14, 2017 12:28 pm
Hello
The Mercury head facing left in an octagonal reserve is a French export mark for 950 standard silver, used 1840-1879. See Tardy, 20th edition, p. 204.
The particular Queillé mark you show is generally thought to have been used 1847-1895. This is by consensus because there is no hard data of which I'm aware. As you know the Queillé family were silversmiths and cutlers for almost a century, and their mark had some variations throughout their years of operation. Therefore, given the dates of the export mark and the maker's mark, you could date your flatware roughly to the second or third quarter of the nineteenth century (ca. 1847-1879).
The RAMU mark would be that of the retailer. Perhaps the retailer's dates of operation might help you to further narrow the timeframe.
Hope this helps.