I'm not the best authority on this but I know that some old bikes were chromed all over the frames.
Whether or not the chromed surface underneath is as shiny as the stays is variable. I think on most cases where it is as shiny is for cromovelato type 'paintwork' where the frame is chrome plated all over and then has tinted clear coat applied to it. I'm fairly sure that this frame is not that (google cromovelato).
Often the chroming underneath the painted areas is duller than the on show sections.
Hope it's "show" chrome underneath the paint.
I stripped an Olagnero, only to find that the chrome was not to the same standard all over.
The rear triangle (which was originally on show) was much brighter than the chrome on the rest of the frame: the original preparation wasn't the same, so there was nothing that could be done about it.
It was tried on here on a somec with a less than desirable outcome.
I'm not the best authority on this but I know that some old bikes were chromed all over the frames.
Whether or not the chromed surface underneath is as shiny as the stays is variable. I think on most cases where it is as shiny is for cromovelato type 'paintwork' where the frame is chrome plated all over and then has tinted clear coat applied to it. I'm fairly sure that this frame is not that (google cromovelato).
Often the chroming underneath the painted areas is duller than the on show sections.
Put well by @Scilly.Suffolk
It was tried on here on a somec with a less than desirable outcome.