Sterling Silver flatware set

This is a complete 12-piece sterling silver flatware set in a hinged, lined box. I think it's Manchester Silver but am not positive -- would love to hear anyone's opinion on this.  I inherited this set from my Grandmother and my father believes it to be from around 1930s.  It also came with a commerative 1776 bi-cenntenial cake server (1881 Rogers mark) and a spoon and serving fork (both marked with silver plated "Italy").