From Amazon buyer review:
The original bulb that came with the oven lasted about 2 years. I bought 2 “G.E.” branded bulbs and both of them burned out within 3 months! These bulbs work great and fit perfect. The filament in the bulb looks thicker than the cheap General Electric bulbs that it replaced. The base is a standard bulb base for the United States. If these bulbs burn out early I’ll update this review.