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I don't believe Chris was saying that black rings are the hardest, or easiest, to find, just that he has a WO-65-2.
From what I've observed over the years here at AW, the WO-65/WO-65-2 sightings seem to outnumber all other Unimatics by 10-1. They must have sold well, and it doesn't hurt that they were around much longer (1950 through 1954) as a single model. The economy in later years of Unimatic production also probably played into lower sales for the single year models, and there were multiple models available each year starting in 1955.
The black column you have would have originally been found in a WV-65, or a 1955 model. They seem to have been common replacements for the WO series washers, as I've seen several here on the board with them.
As for the rings themselves, the black rubber rings seem to have held up much better than the grey (56/57) and yellow/coral rings (58-62) found on later models. The non-black rings tend to have dried up and became bridle. The same can be said of the caps themselves - the black ones I've seen are still pretty supple compared to the grey and turquoise ones.
Ben
[this post was last edited: 10/28/2014-13:34]