Antique Ritz Hotel London Silver Covered Copper Serving Sugar bowl Holloware

Description

The RITZ  Hotel Silver Covered Serving bowl.
This is an early piece from the Ritz (assuming it doesn't have the typical insigne that is seen on later pieces) that could have been used to serve Kings & Queens, Princes & Statesmen.
Heavy piece with a wonderful vintage look.  Heavy and thick
5 inches wide
1lb 9 oz
Marked Goldsmiths & Silversmiths Company LTD,  Has a circled 78 (See photos) And one hallmark
I have not identified what the hallmark means (If you know please drop me a pm)
I did an acid test, and it turned blue for copper
I am not an expert and make no guaranty as to the makeup of this antique bowl.
Below is some research that I have come across.
César Ritz believed that his guest deserved nothing but the very best.
César Ritz quickly gave up using his Paris silversmiths, Christofle, in the early years of this century, turning instead to two of the greatest name in modern English silver-smithing, Mappin & Webb and the Goldsmiths Company.
The two firms soon supplied much of the sterling silver used throughout the hotel and also supplied vast quantities of the magnificent plate still in use today.
Item # GBRd22