Estate sale haul for new member, can you help ID?

Picked up these four watches as a package deal in an estate sale, including two vintage Omega's. I don't have a lot of the details on all of them, would like your help in identifying one of them. (I read the rules, but I don't know how to check the movement of the second watch, and I'm not telling you the price, let's just say I was happy with the deal I got). These came from the original owners, one or both of whom worked in higher education.



First up, what was, and what I hope will be, my favorite. A Seamaster with sub-second hand, calibre 342 bumper, serial no. starting with 133, case type 2758. My heart sunk when I opened the case, but I love that dial and will keep an eye out for a donor movement (as suggested by Al Archer). Be warned, the movement pic may not be appropriate for all audiences...


Next up, another vintage Omega, 14K gold with authentic band & buckle. Based on the subsecond hand I am thinking it's from the 50's or 60's (possibly a his and hers with the Seamaster?), but I don't know how to open the case and would rather not mess with it. Any suggestions?



Next, a "Marvin," a revitalized Swiss brand. Bracelet is not original, dial has a nice patina, have not opened the case yet but it feels like a bumper. Can't get a good case photo because of the bracelet (which I plan to remove), but it reads "10K gold filled L&K".



Last but not least, the Avalon Deluxe, 17 jewel automatic, stainless steel with a replacement bracelet. Have not seen the movement on this one either, I'm a little leery of removing it because the crystal seems loose. Case reads "Incabloc, waterproof, antimagnetic." Seem to be several "Avalons" out there, this one is Swiss, also assuming it's from the same era as the others. Love the dial on this one, but it may be a little small for me.



That's all folks. Big fan of the forum, would welcome comments and especially your insights on the gold Omega, the Marvin or the Avalon. Will try to post the movement pics when I open the Marvin & Avalon.

The gold Omega is likely to be of the 260 family, ie 265 to 269. I like those nice unmessed-with dials on the Omegas. I don't know anything about the others but it looks like a great little purchase, especially as you've hinted it wasn't expensive.

Bumper started off nice until the movement shot, so that's going to need a good overhaul.

Second looks to be a mid 60's model based on indexes and hands. Movement? Can't say.

DON

.
Thanks. I am getting the three working pieces serviced and trying to find someone willing to restore the Seamaster (Al Archer turned it down). Are there any reliable sources for replacement parts for a calibre 342?

Many small second parts are interchangeable among the bumper calibers. One thing that kept changing though was the rotor. Maybe trying to create a more efficient design.

If you need parts. Can look for my name in the watch parts sales forum. No longer restoring, so have parts available

DON