Wow, thanks a lot.
It looks like it's a Quadra 5 (or 10?). There are some on eBay for prices between $10 and $200...most of them are described as "stuck", or "elastomer hardened".
Here's a
working one for $65. Tempted.
Like an idiot I bought this bike without knowing anything about suspension forks, not realizing that the fork is the most important part of the bike that goes bad over time.