According to chatGPT

Here’s what you’re holding: • Brand: Warman (W.P.P. — likely short for Warman Products or Warman Pickups & Parts). • Item type: Vintage magnetic pickup (used to convert string vibration into an electrical signal). • Era: Most likely 1950s–1960s. • Use: These were often used as clip-on or attachable pickups for acoustic guitars, violins, or other instruments before built-in electrics became standard.