Some background: Bach Strads of any description are very rare around here and seldom seen for sale.
Here's the online auction description:
Bach, Tenor/Bass Trombone B Flat, F & E
Comes complete with hard case and stand. Beautiful movement in slide and tuning valves. All in excellent condition.
What was in the photos was a 50B2, silver plated with a French-style case so I guess 1970s. From the photos the "excellent" description was likely accurate. The location was a bit out of the way (a 1 hour flight plus a 3 hour drive for me) if you didn't want to risk shipping.
Unfortunately a bass was not on our houshold's "most needed things" list at the time so I didn't bid. Opening bid was $500 and only reached only somewhere in the $600s. Reserve was $850. The auction site has a facility for the seller to make a fixed price offer to bidders if the reserve isn't met, and it was sold this way. I presume the price was about what the reserve was.
The dollar values I've quoted are $NZ. NZ$1 = US$0.75
At least it went to a good home.