Largely, it depends on how well it's kept up. And RVs (general) of that vintage tend to have cosmetic paint issues (crows feet) - esp dark colors in the southern climates.
What records are available for the coach? If none, it's easy to spend $2k (retail) to get everything changed and back into maintenance spec.
(This goes for every DP, not just Monico)
I was shopping for one in that vintage last year.. Most were no-records, left outside, and would have required a decent amount of work to get them to my personal level of care. However, if you're patient, you can find one kept covered and well cared for... The difference is massive.