Mark,
Yup, that's a single spring with a dampener.

If the border wasn't shut down you'd be welcome to use my on-head checker, but that would only get you an approx spring rate (by collapsing the spring 0.500" and measuring the results). Looks like the only other option would be to pull a couple of these and get them tested on a spring checker?

At least you'll get the spring free height, and that might help narrowing it down to a known spring through a parts catalog.