Ok I found some infor about those GMT's
It seems that 1980-83 the Base GMT had an acrylic Crystal.
Here is a link to a GMT page:
http://www.doubleredseadweller.com/gmt_transition.htm
Hope it helps!!!
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Rolex Daytona 116500LN Black, Rolex Daytona 116500LN White, Rolex TT GMTIIC, Panerai 88, Cartier Santos TT Auto, Omega Seamaster GMT Bond Co-axial, Omega Constellation SS Auto, Tag Heuer Carrera Chrono Tachy Auto
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