Teac cassettes were very common in our collection, after the HX, the X-1 seemed to be the one we got most. Unfortunately, the X-1 was quite “cheap” in the sense that they didn’t put much attention to the jackets – it’s as plain as can be!
There were actually two distinct shell designs which were sold under the X-1 name. The first design was a bit of an oddball one, as it departs from the norm with many different ridges, however the reels are classic Teac.
It’s quite special, and even the side is ribbed.
Finally, here is the spine with original label.
The other shell I’ve seen X-1’s come in, is the same that is used for Teac’s S-HGX and some tape they seem to OEM for others.
In fact, you’ll see quite a bit of the above shell in the collection of cassettes I have. This shell also has been spotted with nylon rollers occasionally: