Satoh Lock Co - Sun Magnetic
It is some kind of a direct entry fence lock in magic module format. It has two magnets which pull the fence. That's where the lock got its name from. Sounds cool, but I believe the magnets do not matter much, if at all. The main work is done by a sprint (when looking into the opened lock) located under the bolt. This spring is shown in the drawing in Mark Bates' book. The magnets may help to keep the fence in the gates, but I don't think they are strong enough to pull the fence in on their own, when the spring has broken. Perhaps when gravity helps. (Most locks were mounted VU.) Dialing is done by 4xR, 3xL, 2xR, L until it stops at 9 and is open. A right turn pushes out the fence and locks it.
The fence has barely no contact with the drive cam until all gates have been set. So there is no CP at all. You can see the missing of the CP on the left photo. I don't think this is due to wear, but a design feature. When turning the dial it is possible to feel very slight indications of one gate. At the current combination it is gate 3 with AWL and with AWR its gate 2. When I try to confirm gate 3 by positioning W1 and W2 to something near gate 3 and then turning W3 alone over the gate I feel nothing. Perhaps I can get more information about an AWR/AWL with a mike. In case I could attribute gate 3 to W3 I would know one number, but I don't see how that helps opening that lock other than shortening the time for an auto-dialer. If I would be able to find the first number, than it might help to find more numbers with AWR/AWL just for W2+W3. So I am not optimistic, that I could manipulate a safe with this lock. The safe where is lock came from was drilled to open.
The lock has no change index. Unlike with other locks I have seen where the mechanism to push the fence out is on W1, the mechanism to keep the fence out is here on the lock cover.
The relocker is the spring above the left magnet.
PS: I think it could be possible to manipulate that lock with a mike.
Martin Hewitt, Investigator Chronicles of Martin Hewitt