A Primer on Typewriter Ribbons & Spools by [[Damon DiMarco]]

Typewriter ribbon is 1/2" wide (12.7mm) which has been standardized as DIN2103.

The DIN 32755 spool, aka a Universal spool, or a Group 1 spool.

Olivetti typewriters use Group 4 spools.

https://www.reddit.com/r/typewriters/comments/18vupsa/database_of_spool_sizes/

LD Ribbon (T677BR, compatible with Olympia) are good ribbons Joe Van Cleave recommends as being inexpensive for about a $1 per spool from Amazon. Although they're DIN spools compatible with Olympia machines, he's used them in his Smith-Corona Galaxie 12. [timestamp 20:37}(https://youtu.be/fwk1jTH5bLA?si=QePpvzF_o80Yq6T3&t=1237)

https://amzn.to/3ywkwm1

Speedy Inks with typewriter ribbon with DIN spools for European typewriter spools (eg: Adler, Olympia, Adler, Facit, etc.).

12 pack for about $10.

Recommended by Joe Van Cleave