Six manuals

[pcnd5584]

I don't know about 1664 or 1764, but there are surely plenty of organs around that have retained pipes from older incarnations.

It seems that "restoring" or "rebuilding" organs can become a controversial topic. Every so often I run into a rant about how some builder "ruined" a once beautiful organ, then 40 or 50 years later another builder comes along and "restores" it to what it supposedly was at first.

This is unlikely - at least in the U.K. It is even less likely in the U.S. or Australasia - for obvious reasons. Unless you mean simply instruments which retained pipework from a previous state - not specifically prior to 1664.

Incidentally, the organ of Wimborne Minster also had a rank changed in 2006.