I have never been able to figure out which movie I saw, must have been early 70's on TV. I was very young and it scared the beejeezus out of me. May be black and white.
Dr Frankenstein creates a bride for his monster, or at least a female monster. I remember vividly the bride was created from a young woman that was crushed by stampeding horses pulling a carriage. Seems her head may have been severed, or at least she always wore a choker neckband to cover the scar.
The male monster pursues the 'bride', but she is in the high society social circles (she is not hideous as he is) and he can never have her. The final scenes are at a social event, perhaps a ball, and the monster enters and rips her head off. Big reveal. Monster mourns.
I can't ID it.