My ProRacer and Pro Am are of another era as your 1991 Pro, but if we compare their positions in the line up the Pro fits in at at least the same level as the ProRacer and definately above the Pro Am.
Your Pro ranked under the FullPro of that year. Same Hardtlite triple butted Spiral Spline frame and full Dura Ace 7400 groupset. Most significant differences were that the FP had a feathereight bonded aluminum fork, while your bike has a neat steel 3ple butted Spiral Spline one. In fact your frame is identical to saddle up's Team Miyata
...and the ones up on eBay.com regularly. Moreover the FullPro had STI and Dual Pivot brakes, both novities for that year that were carried paralel next to the dt shifters and single pivot brakes.
If you ever need a fork for whatever kind of reason for your frame, drop me a line. I have both the Pro and alu FP one laying around.
Of your year I do have the GentsRacer-Carbolite.
_________________official OW 2010 Concours de Elegance jury member
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