You are going to need to take it to someone to get it looked at. Possibly put it on consignment. I can recommend friendly places in CO. Others can probably recommend reputable places in their states as well. What city are you in?
Based on the pictures, that looks like a $500 - $600 rifle. It could be worth more, but without very detailed pictures, or examining it in person, a real value is impossible to give. Based on the pictures the rifle metal appears to be in NRA "Very Good" condition and the wood appears to be "Poor" to "Fair". The wood looks to have dried and split behind the action. Wood can be replaced, but not cost effectively, and will have a major impact on the overall value of the firearm if the buyer doesn't think it can be repaired.
I love the old Springfields and have several. I would not gamble on purchasing it without better pictures or a very good description. It's a nice piece of history and does have value. But value on these old rifles is entirely dependent on condition. And I simply can't tell from the pictures.
If someone from the east coast offers you $1200 for it, I suggest taking it and never returning their calls afterwards.