The steel cased 1675s are the classic GMT-Master and were made throughout all years of the model run (1960-1979). This model is referred to technically as the 1675/1 GMT-Master I, with the “/1” denoting steel; 1675/3 is the technical reference denoting the steel/gold cased version and 1675/8 the gold version. Notably, the 1675/3 and 1675/1 from the 1970s share some components and differ in others, as shown in the table below. This table only applies to the 1970s watches as the 1675/3 was not produced in the 1960s.
(Steel / gold)
|Dial||Brown or Black Nipple||Black matte||No|
|Insert||Brown and gold (brown dials) or Black (black dials)||Red/blue or black||Black with silver writing can be seen on both models|
|Date wheel||White||White||Yes (also shared with gold model)|
|Crystal||T116||T116||Yes (also shared with gold model)|
|Movement||1575||1565 (pre-1965) & 1575 (post-1965)||Yes |
(within accepted SN ranges)
|Bracelet||Two tone jubilee or oyster||Steel jubilee or oyster||No|
The steel model is split into two eras based on the types of dials used. The early dials were produced from 1960-1967 and are glossy (referred to as “gilt” dials), while the later dials produced from 1966-1979 are matte in appearance; both matte and gilt dials were produced in 1966-1967. Below are links to the dials available for the 1675/1. You can find the dials available for the 1675/3 and 1675/8 by going to the “Steel and Gold” and “Gold” menu headers, respectively.