It's either a 1987 model or a 1990 model, both of which were made for the Italian market. Both were limited editions of 500.
The number on the case back will be xxx/500 if it is the 1987 release, or Axxx/500 if it is the 1990 release.
The case back manufacturer's initials C.R.S. must be visible inside the case back. The ref for the watch will be either ST145.0022 or DD145.0022.
Only the bezel is gold (14 carat). The other bits are gold plated.
Hope that helps
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