I don't think that lens was ever produced in a Canon mount, and if it was, it most certainly was not an EOS mount. If it were an earlier (FD) Canon mount it could not be adapted (easily) to EOS. So I think we can safely say that the listed lens should not be listed specifically for Canon mount, it is probably M42.
For these old lenses, it probably doesn't make sense to list a mount at all. For instance, this lens was produced in three or four mounts (M42, Praktina, Exakta...) and several "flavors" (early body, late body, variations in coating...) over a period of 30 years or so. Listing all the variations would be a nightmare.
In the end, what I'd do is look carefully at the construction and markings and if you feel they are the same optic, use that listing. If you are convinced your lens is something quite different, then take a photo of it and submit a request to have it added.
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