Hi David,

Thank you for contacting Mearto with your appraisal inquiry.
I can't quite make out the PP mark and haven't found anything comparable in an online search. You might be interested in this link, which shows what Sheffield silver tea sets are selling for at auction recently (https://www.liveauctioneers.com/search/?keyword=sheffield%20three%20piece%20silver%20tea&sort=-saleStart&status=archive); in addition to the final price, it's worth noticing what the estimates were as they are often lower than the final price.
Based on the photos and information provided, and subject to examination, this is:

A vintage Sheffield silver three-piece tea set
Unattributed maker (mark PP?), bearing date mark for 1964-65, comprising:
Tea pot with wooden handle and knop finial, sugar bowl and cream pitcher
CONDITION: appears to be in good condition with some tarnishing and minor use wear.
PROVENANCE: inherited
$200-400*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.