[TowerTalk] Identify Crankup

[Dan]

I am interested in an unidentified crank up tower. Can someone help in determining the manufacturer?
1. 3 sections, top section about 12 inches/side, lowest section about 17 inches/side, 18 ft long.
2. The top of each section has 3 guy attachment points which look like a chain link welded to each corner.
3. The cable pulleys are a bit larger than those on my TX472, possibly 4-5 inches diameter and the lift cables are larger than those on the TX472. I assume this is to handle the downward force due to guying. 
4. The section guides are short pieces of angle welded to the interior corners. 
5. The tower has a hand winch for lifting.
6, This tower has a strong resemblence to the TX472 and other US Towers. Could it be an early UST or possibly a Tristao? 
7 Does anyone know what it is and , hopefully, its wind load rating?

Thanks, Dan, N5AR