is 1847 rogers bros IS 9041 her majesty pattern silver plate or sterling?

1847 Rogers Bros IS 9041, known as the "Her Majesty" pattern, is made of silver plate, not sterling silver. The "IS" stands for "International Silver," indicating it is a silver-plated product rather than solid sterling silver, which is typically marked with "925" or "sterling." Silver plate items are generally less valuable than their sterling counterparts.