Question about SSL-1

[studio3157]

Good night friends.
This is to greet you and ask you to please answer some questions. Seymour Duncan describes SSL-1 pickups with the terms "glassy" and "bell tone." I understand that they are referring to high frequencies. Can you tell me what they mean tonally?.
I will be very grateful for your answers.

 

[Mincer]

It sounds like a classic 50s Strat. Clean, non-compressed, scooped mids, with piano-like lows and cutting highs, and not a lot of mids. It is the sound of the birth of rock.