OK, looks like we are talking a BV2 for the value of Watson name and OQ1 (best quality SLE) for the original quality grade. Current condition is a bit trickier. Probably not really pristine (CC1 = top 2%). Assuming it is really in original condition and not a restoration, could be CC2 = top 94% to 98% (slightly used) to CC3 = top 85% to 94% (significently used). BV2-OQ1-CC2 = $21,000 and BV2-OQ1-CC3 = $15,700. The case and tools are an indicator (but not entirely definitive) of originality. CC4 = top 70% to 84% (heavy use but no abuse) sounds too low, but BV2-OQ1-CC4 = $12,000 just to frame the price range. We would be talking a gun in the top 15% - 20% of condition.
