Help - Dating a Colnago Master


Retro Newbie
Hi there,

I picked up a Colnago Master. It needs a little TLC and I want to ensure I'm restoring is accurately as possible. I believe it's early 90's but I'd love to narrow it down even further. Identifiable features

Number mount under the top tube
Internal rear brake cable
Chrome lugs on the head tube, painted on the seat tube
Chrome sections on the seat and chain stays (not completely chrome)

Any help or links to resources would be amazing!