need help to indelicate silver hallmark

[musica_humana]

I have large tray which I tested with silver  ER testing solution - and its reacted (Red color)

 what mean  mark  on the back side 25 and hallmark

 Thank you!

[gone_4_good]

Did you make a deep scratch when you tested it? Silver plate will react red

[musica_humana]

Thank you!👍