I'm sorry to hear your dad isn't around anymore. Sadly it happens sooner or later to all of us. That doesn't necessarily make it any easier though, so again, I'm sorry. I'll bet he would have loved one of these.

I haven't bought silver on ebay at all, so do your own research, but here's one that I found listed there. https://www.ebay.com/itm/1973-Fathers-Day-Owl-1-Ounce-999-Silver-Art-Bar-SD33-/253221830013.

I just searched google for "father's day 1973 silver owl bar"