I'd suggest looking (googling) for images of the brand I linked to. Yours might be an earlier model than that one. A trigger is much likely to change vs the motor /handle / gearbox.The pic is similar. The one I have has the trigger switch on the inside
I believe yours is also a Speed Way drill. His switch was on the inside also but got replaced at one time with new technology, lol.The pic is similar. The one I have has the trigger switch on the inside. My grandfather had a garage back in the day (maybe the 30s?). He was around tools and equipment most of his working life. I wish I had more than this old drill.
This one looks like an electric motor with a gear box housed in the attachment with the chuck on top of it. Simple on/off switch and assume one speed.
And by change, I mean a design change, as technology got better.I'd suggest looking (googling) for images of the brand I linked to. Yours might be an earlier model than that one. A trigger is much likely to change vs the motor /handle / gearbox.