A Pair of 2SK405-Y / 2SJ115-Y NOS Genuine TOSHIBA Original Made in Japan MOSFET
fabricated by TOSHIBA around 1991y - 1992y
Lot No. are 2B or 2C for 2SJ115-Y, 1J or 1K for 2SK405-Y

It is a completely genuine new product that has been sleeping in the Toshiba shipping box and the anti-static package unopened in the warehouse of an electronic parts dealer in Tokyo for 30 years.
It's not the suspicious semiconductors of unknown origin that you often see on the Internet these days.
It is highly recommended for those who are looking for TOSHIBA original NOS products without any problems.