Colonial Silver Co?

Hi, since I got such helpful answers re my last question on restoring
vs not restoring cosmetically damaged antiques, I have another
semi-related question. The first question though, is, what might I
have here: An old looking, much tarnished silver plate 2 handled jug
(for cream?) around 4-5 " high, sort of urn-looking with a fancy large
lettered "S" on the front, and with the words: "Colonial Silver Co,
Quadruple Plate, Portland, ME, 1413" on the bottom.

It's so tarnished that the base metal (whatever that might be) is
starting to show through in a few places (but not much). I couldn't
find anything on the internet under Colonial Silver Co, except a blank
listing at a vast site which replaces silver and china patterns/place
settings in N.C. How old might this object be, and is it valuable in
the grand scheme of plated silverware (which doesn't seem to be very
valued at some places I've been to recently.)? Also, I'm assuming I
should again leave this item be, and not attempt to remove any of the
eons of tarnish on it. Thanks for any help.