This is a Colibri Rollerball pen, datable to the early 1980's,
Gold plated over Brass.
Colibri was very famous for the quality of its pens and lighters,
it was among the luxury brands in the sector.
Pens with real lacquer coating have always been very expensive
and appreciated by amateurs and collectors,
and the process of coating a pen with real lacquer is long and expensive,
but the final result is compelling.