claidemore
Senior Airman
A couple more photos to support my theory about Yak 1 cockpits. There is also a photo of Yaks on the assembly line at Saratov which shows the 2nd style of cockpit, indicating that the field modification was adopted at factory level, but that the bubble canopy was a later change. Interestingly, the LaGG 3 and La5 had the oval window cutouts as well.