Did Shure ever manufacture the Beta 58A with a gold finish?
No. The Beta 58A has never been sold with a gold finish. Gold is a soft metal. When used on the surface of a microphone handle, it shows wear quickly.
However, in 1995, Shure did supply a custom gold Beta 58A to the artist Prince (Rogers) for use on his tour promoting "The Gold Experience" album. See the photo below.