Is this a sterling hallmark cup? Help needed

[Hightek]

Hi, I went to a thift store today and saw this silver cup.
Can someone help identify this hallmark if this is sterling?

 

[nhbenz]

Corbell & Co ElectroPlate is what the initials stand for. (So they’re plated)
About Us

 

[niffler]

The three towers is a Danish hallmark usually. I don't know if yours is or not though. Danish Assay Marks (statsguardein) - Encyclopedia of Silver Marks, Hallmarks & Makers' Marks

 

[niffler]

Nhbenz is correct though!