I've never seen a safety pin like that in my life as well
It does look a bit like a lightbulb, but it does certainly have an odd shape compared to the pins we have nowadays.

I understand the great uses of safety pins but if you asked me it is ironic that they are called safety pins since I've been pricked and pierced many times haha

It is pretty amazing how such a simple small, intuitive invention can revolutionise and make many people's lives that little bit easier without many of us even realising and may simple pin will be the future @kiligirl haha! :)