The worth of the organ isn't the issue. The worth of YOU is the issue. There can be a broken wire (or something similar) inside that instrument, and it could give you a 220 volt shock.

Have you ever had a course in electronics? Do you own a circuit tester? Dish!

Let me tell you a story about my brother's friend Henry. One day Henry tried to move a coffee maker at his place of employment. (Henry was 35 - 40 years old at the time.) The coffee maker was turned off, and it was plugged into good wiring with circuit breakers or fuses. Yet inside it was a broken wire, and it gave Henry a shock so bad that his heart stopped beating and he collapsed.

Fortunately his co-workers called for help, and EMT's got his heart going again.

Back to the organ. Has it got a broken wire that you might touch? Have mice chewed on it? Has some tinkerer interfered with it? Has it been stored in the heat and cold (say in a garage) and been allowed to deteriorate? You don't know.

If nothing else, get a buddy, somebody knowledgeable who will work with you. You can reward him with a nice dinner and some bossa nova music.