VINTAGE set EPNS Pitcher/Sugar/Creamer KS G4536 Nickel? Silver Plate?

Description

VINTAGE set EPNS Pitcher/Sugar/Creamer pitcher marked KS G4536, Sugar/Creamer marked G3756.  Are they  Nickel or Silver Plate?
This set weighs about 2 pounds.  I have tried to picture the scratches and wear.  I have no idea on how to care for these type of items, so what you see is what you get.  I did not try to do any cleaning or polishing
.
Descriptions are to the best of my ability. However, I am not a collector so may not know the best way to describe the item. Please feel free to E-mail me with questions or for more pictures and check out my other auction items
.  Please view all pictures, any damage will be pictured.