This is a set of silver plate made by Lee and Wigfull Ltd of Sheffield, England after 1899
when they began using the trade name Insignia Plate on their flatware. I realize this mark does not have
the ltd after the name, but they still used this circular mark after 1899 from what I have found in
my silver books (can't always trust all of what is written on the internet).
The term A1 is the quality of plating and EPNS means Electro Plated Nickel Silver.
The pattern is a 1920's pattern named the Grecian pattern, and the canteen full of
56 pieces has a value of $125 to $160 retail.
Some sites that I recommend for selling are Varagesale.com, Ioffer.com, OfferUp.com, Ebay and letgo.com.
You can also go to invaluable.com or liveauctioneers.com and search their directory for an auction house near you and consign to them.
To finish, I will need you to click the five stars at the top of your screen and hit the submit button, thanks!