Pair of Silver Mustard Pots

I have a pair of silver mustard pots with blue glass liners and matching spoons. Both pots and spoons all have the same hallmarks. I would like some advice on what they may be worth and best place to sell them please. Photo’s attached. The letters are R&D then an anchor the lion and year mark is a capital P in a shield shape. Any help much appreciated

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The marks are for Birmingham 1939 with the maker being Roberts & Dore of Hatton Garden.
To be honest the best place to assess market value would be on the completed section of the well known online auction site.
Regards
John

Thanks John Having never sold anything before I am so ignorant and do not even know the well known on line auction site you are refering to.

eBay

Thanks for all your help