Is there a list somewhere of the types/names/styles of Schick TTOs? I've been using my grandpop's old safety razor and I don't know anything about it other than its a Schick.
Does it have a black plastic handle? Thinner near the head? If so, you have a Krona. You could always check the wiki.
They made the Schick Krona.. I think that is the only tto model made by them.
That is a black tip Krona.
There's a silver metal tipped one, and also a type with a gray handle instead of black.
It is a great shaver! You're a lucky guy to have one!