Can you show us the whole blade without handle and habaki?
Looks a little suspicious to me, not necessarily a fake, but maybe tampered with.... the pictures are not very sharp so I could be totally wrong...
The horimono does not look crisp or well done at all (pictures?) and the kanji on the blade looke a little 'fresh'.... not sure what the first Kanji is but the second is:
ä½ã€€- sumu
or
ä½ã€€- juu
Is the cutting edge dinged?? or is that just another low quality picture? Seems it could be originally a longer sword cut down (shinogi is present), but we would need better pictures and to be able to see the nakano too....
Koshirae seems OK...
My best guess.... longer wakazashi cut down, and someone (far from professional) has tried to glam it up with horimono and kanji... however I most probably am quite wrong!
Cheers