If this were sterling silver, it would have hallmarks like the ones in the banner of this forum - a maker’s mark, a lion (for sterling), a mark that indicates which assay office tested the piece, a date letter, and sometimes a monarch’s profile. If it’s a U.K. piece (and this certainly is), and it has no such hallmarks, it’s plate.
The markings on plate are whatever the maker feels like putting on there, so it often doesn’t provide much useful information. Things like pattern numbers are usually not well-documented, and some of the language used is just marketing puffery (like “Argento Silver”). In this case, “2 PTS” may just be the capacity of the vessel.
It’s all here:
For comparison, here are the hallmarks on a piece of Walker & Hall sterling. First is Walker & Hall’s registered maker’s mark, the crown indicates the Sheffield assay office, the lion for sterling, and the date letter “u” for 1937. See the entry for it on this page:
https://www.silvermakersmarks.co.uk/Dates/Sheffield/Date%20Letters%20U.html
