it has been resprayed as a aa super but looks to me like the a frame which is 531 but with no orig badge I cant say for sure- TK has your old gazelle right?
Gazelle was owned by TI back than, so that explains why Reynolds was used for pretty much all Champion Mondials. There are a few exceptions in Columbus though.
Very nice Gazz, I have a nice shiny cinelli xa in 26.0 flavour that would look nice on there What is that lovely chainset, is it a Suntour superb like the rest of the gear set :?: