I am afraid that the so-called "Swiss mountain cat" (considered extinct) was not Swiss, but probably a crossbreed between Siamese (or other oriental cats) and European natural breeds, such as "alley cats" (a more recently recognised European standard, i.e. the European shorthair - distinct from the British and the American shorthair - is a mixture of the originally domesticated breeds beginning with Felis sylvestris lybica, the African wildcat, then F. s. ornata, i.e. Asiatic wildcat, and [eventually crossing later with] F. s. sylvestris, i.e. the European wildcat).
How about "J"?