The aircraft type was officially named MiG-1 in December 1940; this name was already unofficially used in the factory to design the aircraft, that was still officially named I-200.
It is not clear if all the production planes were at this point equipped with the rearward-sliding canopy, or if some of them had still a hinged canopy as for the prototypes. Some sources claim that first 8 MiG-1 had a canopy as that of I-200 prototypes, but the hurrily built MiGs were usually updated by factory brigades, and it looks likely that the old style canopies were replaced before the war's outbreak.
By the end of 1940, all 100 MiG-1s were built, and the first 20 of them were delivered to the VVS within the year, with the rest delivered in early 1941.  The first operative units to receive the new aircraft were 31st IAP at Kaunas Air Base, in Lithuania, and 41th IAP at Belostok Air Base, in Soviet-occupied Poland.
It was necessary to conduct tests of series I-200 under operative conditions. During the period from December 1940 to February 1941, pilots and ground crew of 41th IAP conducted operative tests at the Kachinskeye Military School for Pilots. The supervision was by the test pilot Suprun.
Before these tests, the retraining of crew was taken in charge by NII VVS, that started with the pilots of 146th IAP.

Pre-war photos of series MiG-1 are exceedingly rare. Sadly, nearly all the few photos available of this type are of German origin, and represent wrecked or captured ones. Besides, photos of captured ones usually show airframes that had been vandalized by souvenir-hunting Germans.
 

These photos of operational MiG-1s captured by Germans show clearly the shorter radiator and the different undercarriage covers from the MiG-3. Perhaps one can notice the slightly shorter nose too, with exhaust stacks slightly overposed to the panel behind them, small difference on the nose inlets and bulges, shorter air intakes at the wingroot, smaller diameter tail wheel with doors without cut for protruding wheel, minor wing dihedral, but in all other respects (sliding canopy etc.) this aircraft resembles an early MiG-3. None photo of MiG-1s with prototype-style canopy is known. Note the small red star with black outline on the fuselage. A piece of fabric has been removed from the rudder by some souvenir hunter; it possibly had a 7 painted on it. Click on the profile below to see a page with more photos and color drawings of MiG-1 in June 1941.