that miele leaves me thinking its a bit suspect.
mish-mash of components is something every miele would see, but the no-name drop-outs are something i wouldn't expect on an SLX tubeset... the decals look post 1990, really plain lugwork, no chrome, and nothing on the seat stays....
the only bit of saving grace is the lack of braze-ons for fenders/racks, which may or tend to indicate the bike has tight geometry and hopefully worthy of the SLX sticker...