Can anyone identify this IBM magnetic tape cartridge?

The magnetic tape you have is for the IBM Magnetic Tape Selectric Typewriter. This machine was the first "Word Processing" device ever marketed. It was introduced 40 years ago in May of 1964! Neither the term "word processor" or "text editor" existed at that time. After being on the market for about two years IBM sales representatives familiar with "data processing" began to call the concept "word processing", thus the term evolved. The product was priced at $10,500 (in 1964 dollars!) It included a full size Steelcase desk with a recessed typewriter and a tape console 1' w x 2.5' d x 3' h that weighed about 100 lbs. Text was entered on the typewriter keyboard, recorded on the tape and edited by playing text back from the tape a character, word, line, etc. at a time. Print speed was an awsome 15 characters per second.