Jim Miele had his people building bikes out a variety of tubesets (even the same model a year or two apart seemingly varied in some cases), so without the sticker, it could be tricky. I've seen bikes around this level (judging by the components) made out of Tange 2 and out of Columbus Cromor, and I know they did their high-end models in SL, etc.

Is that a Cinelli XA stem? You say it's unmarked, no logo on the front? Would have to be a Cinelli, I would think, with the proprietary clamp size, given that it has an older Cinelli bar. And I've seen a number of late-80s Mieles with XAs.

Any evidence of a serial number? They don't necessarily have one (my ~1987 Lupa doesn't, from what I can tell), and it may be elsewhere than the bottom of the BB shell. Tmar is interested in serial numbers for these bikes, and has proven impressively knowledgeable about the model range and equipment in previous posts regarding Miele cycles. Myself, I wouldn't venture a guess. Certainly a nice bike, and likely a good tubeset, though.