Wiktionary
silver top
n. (context British English) full cream milk#English, normally homogenised and pasteurised, having a silvery top to the bottle.
Wikipedia
Silver Top
Silver Top is a 1938 British crime film directed by George King and starring Marie Wright, Betty Ann Davies, David Farrar and Marjorie Taylor.
Usage examples of "silver top".
I don't like the name of the first variety, and, if they do much, shall change it to Silver Top.