Grandpa Jack's bike

[Pantmaker]

I know this is a long shot but my grandfather is the second guy from the right and I would love to figure out what he is riding here. It was pre-war as he was a senior in highschool. Any clue or clues?
http://imgur.com/xgHNpTt

 

[FlordiaRust]

From my guess its a 1935-39 Colson with that peaked front fender.
The 1st bike is unknown,2nd one looks to be a Schwinn model from handlebars and headbadge, 3rd Colson, 4th Roadmaster from the front shocks. And that about all I know from my entire life of working with bikes and bike parts.

 

[Pantmaker]

Thank you for your input. I appreciate it.

From my guess its a 1935-39 Colson with that peaked front fender.
The 1st bike is unknown,2nd one looks to be a Schwinn model from handlebars and headbadge, 3rd Colson, 4th Roadmaster from the front shocks. And that about all I know from my entire life of working with bikes and bike parts.