Silver Tray Mystery Mark

British Silver Reading Silver Hallmarks
1

I know a picture is worth a thousand words but my mark is so worn I’m hoping someone can read it:

letter O - artichoke symbol? - letter M
letter D - wheat stalk symbol? - letter I

Gorgeous tray measures 6.25" x 4-5/8"

2

How much does the tray weigh?

3

6.2 oz.