I found my IIa at a local estate sale, took a chance on this unknown to me, and the fact that it sat all morning without takers!
Upon inspection, it just looked new! Only negative parts were that leatherette peels of a bit on lens door (need to get right cement) and a small part of the leather case stitching is coming loose.
I did read about the film advance potential issue, but I do not see, or feel a problem.
Is there a preventative measure to apply?
Per serial number, it was probably bought in Germany by a U.S. serviceman, recently departed.
I am a bit emotional with objects' history at times, so I am with this camera.
Congratulations on finding this fine camera, Jay! You're going to love it, I'm sure.
The leather patches (yes, its real leather, not faux leather!) can be glued back down with a single coat of contact cement. Don't use Epoxy or anything TOO permanent, in case it ever has to be removed in the future.
Regarding preventative measures to avoid problems with the film advance/winding mechanism - question about the mounting of the accessory shoe: are the three screws mounted from the top/exterior of the camera housing, or from inside the top cover? See the photo, which shows the screws mounted from inside the top cover.
If the accessory shoe is mounted in this configuration, be sure all three screw tips are visible as shown in the photo I attached. If there is an empty hole in one or more of the accessory shoe screw holes, then the screw has backed out and is floating inside the top cover somewhere. If that is the case, then at the very least the camera needs the top cover take off, find the misbehaving screw and put it back where it belongs. Now, taking the top cover off is fairly straightforward, but it requires the removal of the winding lever, and that has to be done in a very particular way. But I am getting ahead of myself - first determine if the screw are all present, and if not, then ask me for further assistance. If the crews are mounted from the exterior of the camera, then you don't need to worry about the "loose screws" issue.
Is there anything else you can do to avoid potential problems with the cocking rack and winding mechanism? Well, if the camera is clean and been well cared for (and hopefully serviced at least once in its 65+ years of life) then you may be able to use it without undue concern. However, if there is a lot of dried grease in the mechanism, and/or dust and grit from too many trips to the beach in 1959, then it would be smart to have it properly stripped down and cleaned. Then, you will have no worries.
By the way, do you know if the frame counter works? Does it count up with every winding and firing of the shutter? There is a tiny "spring" inside the film advance lever assembly that has to flex with every counting of a frame, and it inevitably weakens with use and the tip breaks off. What that means is that the camera no longer counts frames as you go through the roll, but otherwise it doesn't adversely affect the functionality of the camera. Replacement springs are available from Micro Tools USA but they are extremely expensive (undoubtedly more than you paid for the camera!), so most times, people opt to live without a functioning frame counter.
Paul