What you have is not a Mosley, it's a Hy-gain.
The element-to-boom clamp shown in your photo (http://img245.imageshack.us/img245/1378/elements2vh0.jpg
) is unique to Hy-gain. Mosley uses u-bolts and flat plates.
Likewise, the "slim" trap in your photo (http://img72.imageshack.us/img72/3692/trapup1.jpg
) is the size that Hy-gain uses. Mosley traps are much larger diamater. Also, the aluminum compression clamp shown in that photo near one end of the trap is what Hy-gain used for many years, until switching to "worm-gear" hose-clamps.
However, based on your description, I don't think you have all of the parts.
Yes, the coax attaches to the bolts shown in your photo (http://img162.imageshack.us/img162/9043/element3wy2.jpg
) but they also serve to anchor some small-diamater tubing (or solid aluminum rods) and clamps that make up a beta match.
In addition, you say you have only six traps, two per element. Mosley antennas use two traps per element (actually, their "fat" design is because they're really two traps inside a single enclosure). But Hy-gain antennas use separate traps for each band (15M and 10M) so there should be twelve of them, four for each element.
Based on the 14-foot boom, I'd say you have (at least part of) an early TH3 series tribander (known years ago as the Thunderbird). There have been four versions, most recently the TH3-MK4. They're all basically the same: 14-foot boom, 27-foot longest element, 15-foot turning radius, 5.8dBd forward gain, 25 dB front-to-back ratio, full legal-limit power capacity, 4.6 square-foot wind surface area, 95 mph wind-survival rating.
Hy-gain (now owned by MFJ) still makes them. You can download the Assembly/Instruction Manual from their web site:http://www.hy-gain.com/products.php?prodid=TH-3MK4
You can also order parts to fill-in what you're missing, replace the worn-out plastic pieces, and substitute stainless steel hardware and clamps for the rusted-out stuff you have.
It could be a worthwhile restoration project. The current list price for that antenna is $470 and very few retailers discount it.
It's a terrific antenna. I had a TH3-MK3 up for 25 years and never had to touch it through high-winds and ice storms until one of the traps finally failed (due to mechanical stress). I replaced it with a TH3-MK4. Up only 35-feet on a roof-mount and running no more than 100 watts, I've worked 225 DXCC countries and snared several Top Ten contest certificates on 10 and 15 meters.
Mel - KS2G