What if there is no trademark?

Hi. First time posting. I have a serving fork and spoon that I’m trying to identify. They are stamped STERLING on the back, but have no other identifying marks, so I’m having a rather tough time. Also, I know nothing about silver. They measure 19 cm. and have a flower pattern, something with five leaves, looks like a lily. The fork has a line of silver going across the tines (correct word?) about halfway up. Please see pictures also; I hope they’re “good enough”. Thank you to anyone who can offer any help.

Unfortunately, if no one recognizes the pattern, you will have a lengthy search. Probably American. All I can suggest is to search for the pattern at replacements.com , but there are thousands. You could keyword search on the flower to narrow it down, if you know what flower it is.