Anyone able to identify this silver hallmark? Photo attached

[AliceInWonderlost]

I think it's Thomas Blake and the marks look like ...

A T H B S

And then... I P? Maybe

Any help appreciated

Is that definitely an IP or a part rubbed out EP?
Could be just electroplated if it looks like a worn EP.

It’s silver plate.

Before the days of readily available reference books, makers of cheap plate added marks which resembled hallmarks.

https://www.silvercollection.it/dictionarysilverplatepseudohallmarks.html