I did a quick search, and found mostly nonsense like this:
Reportedly, these Korean pickups were discovered in 2014. Doing the math, they were made all the way back in 1999!Opportunity knocks! Danelectro's pickup supplier "misplaced" a load of lipstick pickups in their warehouse only to discover them recently 15 years after they were manufactured.
When the folks at Danelectro listened to them they realized that these "New Old Stock" wonders have more twang than any Lipstick ever. Is it because of the aged magnets? Or the materials used 15 years ago? Who knows. Who cares. They just sound great.
No one knows the secret of their magic mojo. Perhaps they were stored underground with jars of kim chi.
Should you agree to take on this silly project, here's a suggestion:
Ask to borrow one of the customer's Dano pickups, and measure its inductance.
Add wire to the Silvertone until its inductance is in the same ballpark.
As a general rule, more turns equals "fuller and rounder".
Alternate suggestion: Try potting the Silvertone with kim chi.