Capacitor Tantalum Electrolytic Soviet-Era K52-1VB 'Silver Slug'

Oxide-semiconductor tantalum capacitors for operation in constant and pulsing current circuits

Rare capacitors from a trusted source. 

Body comprised of solid silver and other elements

Availability in selected combinations of capacitance and rated volts

Does something magical to the tone of certain circuits :)

'V' designation is all-climate version