All good advice above.
another is 
www.gbase.com
lots of martins for sale including your era.
I am looking to buy a  Martin dreadnought at the moment and have looked at hundreds over the last few weeks.  The Brazilians are highly sought after..and will only improve in value.  
Note current models made of Brazilian are going for around $30,000.  
If it has no cracks and repairs it will be worth a lot of money.  Sure you want to sell it? Think these will keep going up in value.  Not a bad investment to sit on...if you can keep the himidity up and the cracks away...