This vise is either very old, or a much newer Hollands. They stuck to the number/jaw size for the most part, and a 59 should be a 9". The 50 series that I have seen up to 56, was their combo series. In theory, this should be a 17.
Also different on this vise compared to most of the stationary Hollands pictures I have seen is the base. The Hollands stationary vises I have seen, the 2 side & 1 rear feet/ears are all together, rather than sticking out independently like "ears". (see pic below)
There are a couple of guys on here that have nice collections of Hollands, Demoman for one and can't remember the other member, but he has most of the stationary series, they and others may have more info.
As a keeper, a 7" & 200 lb vise, I think it is a great deal.