[Unopened] SONY INDEXCARD 25VE Index Card Lettering

Found this at my parents' house.
I believe it's a very valuable item.

Unused and unopened
SONY
Index Card 25RD

I am listing 4 types.
#ぼんちゃん_インデックスカード

Product from over 40 years ago.
I believe the condition is good.

Index cards: 25 sheets
Number seal: 1 sheet
Index lettering: 3 sheets

- Brand: SONY
- Model: INDEXCARD 25VE
- Quantity: 25 sheets
- Type: Index card sheets

This is a product from about 40 years ago.
I cannot guarantee if the lettering is usable.

25GY, 25RD, and 25GN are also being listed.

Unused and unopened.
This is an old item that has been stored at home.
Please refrain from purchasing if you are sensitive about condition.