For 123GO
The Lincoln 2000, also known as a 93640 model, is an oldie and a slightly cheaper version of the 93642 model.
It does not look restored, it simply was not used much, which could be a drawback as the urethane u-cup seal tends to last longer when the jack is used regularly as this "exercise" keeps the seal pliable. In a jack that sits unused for long periods of times, the u-cup seal tend to harden over time sooner and become brittle, than in a jack that is used regularly. This can make the jack dangerous as you don't know the condition of the seal, and although it looks very good paint wise, the seal could have hardened enough to break apart in a short period of time. And when the seal breaks, the jack comes crashing down without any warning.
Anyway, any urethane u-cup seal will eventually harden and become brittle and break. Depending on the quality of the material and usage, some will last longer while others will last less time. And the age of this jack means that its seal may not provide many more years of use and may even require rebuilding in a few years. Many of the Lincoln jacks made in the early to mid 90's have already broken their seals, so this one may not be to far away.
The price is rather steep for the age and model of the jack, and since it looks almost new, you may no want to replace the u-cup, thinking that it should be as good as the jack looks. Better find a cheaper model that needs repairing, so you know that you are replacing the seals with new ones.