Does anyone know what year this is?

[Redd Rockett]

It's a Columbia built JC Higgins and the serial number on the left dropout is K163000.

 

[twojs.bike]

I would guess late 60s. But that is just a guess.

 

[musclebikemadman]

I agree early '60s, I had same guard on a '61 I sold. It is a Columbia made bike I believe. I have the correct rear rack for that.

 

[Wildcat]

K is 1961.

 

[Redd Rockett]

K is 1961.

Thank you!