This model was produced between 1964-1969 and has two distinctive features that identify it as a transitional model. In the 105.002-62, produced in 1964, a major change in aesthetics was noticeable: the permanent switch to baton hands. The ST105.003 was dubbed "Ed White" by enthusiasts after the first spacewalker (during Gemini IV), and it is the last "straight lug" Speedmaster.

Astronaut Ed White is seen floating in microgravity outside of the Gemini IV spacecraft. His ST 105.003 is clearly visible on the left wrist, attached to a black Velcro strap (Bell & Ross Replica).

The ST105.003 is also known as "Pre-Professional" by some, as it passed NASA tests in 1965 and became the official watch of the astronauts on the Gemini missions. This model is now commonly sold at prices of more than PS20,000.

The ST105.012 was the first in its line because it featured the famous "Lyre", or twisted lugs that included guards for both the chronograph crown and pushers. Petros explains that the use of "Professional", which was the first time the word appeared on the dial before NASA's results were known, dispels the myth that the word was placed there for this reason. Petros says, "It's just a coincidence NASA tested the non-Professional watches, and later when NASA ordered watches -- four batches -- the second order consisted of both."

NASA tested only watches with Calibre 321, and all the original deliveries they received for Gemini and Apollo were only 105.003, 105.012, and 145.012. It is very important to know this if you only want watches that are identical to the ones NASA used. NASA is thought to have acquired 98 watches, from which the astronauts could choose.

The 105.012 is notable for being the first asymmetrical case with shoulders protecting the pushers and crown. Buzz Aldrin was wearing this case style a month prior to the "Ed White". This writer regrets that he purchased a 105.012 once for US $250. One would expect to spend around PS15,000.

In 1966, two casemakers La Central Boites (IWC Big Pilot Replica) produced the cases for 105.012 watches. The watches produced by the former have an extra step at the top of the lugs, which is often accidentally polished during service.

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