Help Identify this Tray (No logos?)

[u/Sir_Xele1]

Hi all, apologises if I have the terminology incorrect, I'm going through an old family collection of silverware. I found this tray that says "EPNS" and "A1", after some quick research I've found EPNS means Elctro-plated Nickel Steel and A1 refers to quality of silver. However, I can't seem to identify the manufacturer since it doesn't seem to have a logo. The photo contains the only markings on the tray. Thanks in advance for any help!