I think i have what looks to be some sort of a dish with lid (???) with the markings WH & SBP. I have been trawling resources trying to identify this mark and believe it may be american as the only resources i can find have the hallmark on other items from america from around the mid 1850’s. The actual handle on the lid comes off to reveal a patent number which i have checked on the american patent website which brings back a date of 1848 but no other info. I am not sure it can be this old and from America despite the amount of cleaning that needs doing to it!!!
I can’t photograph the hallmark clearly enough to post unfortunately. I have attached a picture of the item anyway.
Any help with what it actually is used for or hallmark would be much appreciated!