Hammond J-122. Worth purchasing?

[Colm McCarthy <illusory@execpc.com>]

Hi,

My wife and I are considering purchasing a Hammond J-122 (sn 29530) from
a workmate.  Neither of us knows a darn thing about Hammonds and we are
wondering if the J-122 is a good model.

The organ is in beautiful condition and plays just fine.  The seller is
asking $300 for it.  Is this a fair price or are we being ripped off?
Incidentally, any idea when this model was manufactured?

Sorry to post this to everybody, but I surfed and surfed and found very
little info on the J-122 (which I presume belongs to the J-100 series -
as I said we know nothing about Hammonds :-), and any assistance would
be much appreciated.

Thanks

Colm McCarthy