Same generation.
I don't remember all the details, but my dad was the designated disciplinarian parent - my mum used to threaten that if I didn't behave, my dad would give me a smack. The trouble is, my dad was quite bad-tempered, so you didn't really want him in charge of hitting a child... Like most children, I was occasionally a little shit who wound up both my parents, and there were occasions when my dad lost control.
As an adult, I can understand it all, but I wouldn't repeat it, and I wouldn't recommend it.
I grew up distant towards my dad. His being the one to smack us was the reason for it.
I feel a bit sad for him and blokes of his generation/thinking - it's pretty obvious looking back now that if you were the main parent to do the smacking, especially if you worked long full-time hours (like most fathers did at the time), you were always going to have a distant relationship with your kids. My mum didn't hit us nearly as much, she was home more and she was our primary carer.
I'm very close to my mum. I was never able to narrow that distance with my dad.
I have since forgiven him, but I wish we were closer, and I think the fact that we never were is his punishment for being a parent who smacked his kids. I suppose in a way I have to live with some of that punishment too, but he's the one who suffered more for it.
I can't imagine having kids and doing something to close their hearts towards me in that manner. I don't blame him. It was normal back then. But it's behaviour definitely best left in the past.
OP - I don't remember much of my childhood, only moments where I had a strong emotional response. Some of them I don't remember properly - from talking to family, I do have some incorrect perceptions (which you would expect given my age at the time).
It's tricky with something like this, because the way you describe it, who would admit to it going down exactly like that? So, you'll never get 100% closure on how accurate your version of events was.
I feel doubtful you'll get what you need from discussing it with her now (it might even be more hurtful if you find out she's forgotten what was such a big moment for you). Instead, working this through with a therapist is more likely to shield some benefit.