what does that mean?

What does the "Well, I don't know what I wouldn't too" mean in the exchange below? I can't make heads or tails of it...

Tell you what, Sherry: if I had a wife, which I'm deuced glad I haven't, I'd rather have one like your Kitten than all the Incomparables put together.'

'You would?' said Sherry, staring at him.

'I would,' said Mr Ringwood firmly.

'Well, I don't know but what I wouldn't too,' said Sherry...

from Friday's Child