Postby robert12 » Fri Apr 24, 2015 3:33 am
Hi, your dish is Sterling silver, the mark is actually SP&Co a Sheffield maker mark on "www.silvermakersmarks.co.uk" website.
Unfortunately there is no maker attributed to the mark there but the mark has been seen on a 1964 dish which ties in with your 1961 dish.
Perhaps some other members can give you more details.
Robert