My late grandmothers hawthorne tank bicycle what year?

[plymouthrock]

I can't find any numbers on it anywhere. I was just curious what year it might be. I'm going to clean it up not restore it. I rode this all over town when I was a kid visiting

 

[plymouthrock]

Pics

 

[Rustinkerer]

Looks early 60s, depending on which chain guard it has. -Adam

 

[plymouthrock]

Here's the chain guard