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Thought you might be interested in this.... A few of the causalities. All done

I would use Loctite 648. It's specifically for locking cylindrical fits, basically permanent unless significant heat is applied. Clean with acetone first!

I always find it's nice to have a picture of the entire watch if there's anything interesting about it or a link to the site below so I can see a picture of it. The problem with more unusual watches will be to find the parts. you can go to cousins and download the 69 in the 68 parts list and get parts numbers if you can figure out which part is yours? another source of information would be the best fit books. So I snipped out the relevant pages where if you could identify a part that looks like yours at least it give you part number. the second and third link have your watch parts. The reverser that were not sure what exactly that is looks like it interchanges with a lot of of their watches like the 215 S. due at the PDF parts list for that maybe you can figure out which part is your mystery part so I'm attaching of the PDF for that. http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Universal_69_0 http://cgi.julesborel.com/cgi-bin/matcgi2?ref=UNI_69SC-C http://cgi.julesborel.com/cgi-bin/matcgi2?ref=e[]IZD. Universal_Universal 215, 215-07.pdf

it's why if you look at an American pocket watch the serial number is visible on the back side. All the rest of the plates will have a partial serial numbers so all the parts will come back together if they get separated. typically the balance wheel has the serial number scribed on it.

If there are no points or ridges to grab on, then it's not a screw back. However, for this and most other questions you need to post clear pictures taken from multiple angles.

I think marc is close, but it goes further back. Here you frequently see old wooden boxes with 5 compartments, and several smaller compartments in those, which were used to hold movement kits that were being finished. The finisher would mark the parts to keep order among the 5. If you pay attention you'll see IV, or II, or V etc. on different compartments. Sometimes it's little dots. There was a lot of hand work on old Swiss stuff.

I have seen similar marks on various watch parts in the past, some of which suggest that a watchmaker has cleaned parts from several different watches in the same basket at the same time and has marked the parts to show which parts belong to which watch. Either many of the parts from the same watch that I have been working on have the same mark (1, 2, or 3 lines, or a v) or the calibre has been scratched onto a part. I have even seen the marks duplicated on the case. It is just speculation on my part that this is the rationale behind these marks, and if I'm correct then it has to be acknowleged as being a pretty poor practise if not out and out vandalism, but the marks always seem to me to have been made as part of a service procedure, they don't look like they were marked up during manufacture or assembly.

I guess the pic is just for desplay, are first and second gears in right jewels( place)? Regulator arm is unconventionally close to the stud.