About a year ago, I dug up what I believe to be an American coin silver spoon dating from the late 1700's, early 1800's. I can't find any lettering on it; rather, there are four marks on the back of it:


The marks appear to be, from left to right: an 8-petaled flower, a cross, a leaf (maple?), and I really can't tell what the last one is...?
I've looked everywhere on the internet for symbols similar to these, all to no avail. Any information would be tremendously appreciated!! :)
Thanks!!
