That's why I don't subscribe to Paul's there will always be another one mantra. Every Alembic instrument is unique. While the differences between two Spoilers may not be that great, the higher end instruments tend to magnify the variations for me.
Sure, there will be another 70s Series SSB for sale down the road, but not in this condition. If this top resonates with you, you won't find it on any other bass. At this level, there have to be regrets when one you really want gets away.
-bob