Button Vs. Pin years?

[hhisc16]

I just bought two DVC Buttons on Ebay and a DVC pin on Ebay for DHHIR.

(Button dates are unknown, but DVC pin is labeled 2000)

Were DVC buttons before 1999 and DVC pins after 1999?

What years do we think each button is below?

 

[hhisc16]