Thanks guys, it's great to feel welcomed and to have such immediate response
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Bulldog, it looks similar to the one in the image (ie, the gold plating is in all the same places) but the 3rd valve slide ring is fixed and there are two vertical braces towards the back, one on the main tuning slide and one the other side on the body. Perhaps those are the differences between the Bach Soloist and the Bach Strad Soloist?
It seemed a little more open and free than the 37's they had there as well (although this could just be natural variation within the VB range), so maybe they've enlarged the bore slightly or changed the bell construction...