Need help identifying my Columbia

[Clarner]

Looking for help identifying the model of my recently purchased 1957 Columbia. Narrowed it down to possibly 2 models, but thought I would ask the help of experts. The chain guard and no badge is throwing me off so making it difficult. Any help would be appreciated. TIA

 

[J-wagon]

Some info in this thread
Post in thread 'Need opinions on this rack....' https://thecabe.com/forum/threads/need-opinions-on-this-rack.143230/post-958412