help identifying frame please

Jan 21, 2009
Zambales, Philippines
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Click on the pic for a large version. The upper right bike is also the same, with the little jet symbols. I think that's the right chain guard, just a different model than shown in the ad. If a guard needed replaced, it was usually one of the common aftermarket ones, not a Columbia model. It also matches the color, if you take it off the red paint under the bracket may look like new because it's always been on there. But they may have removed it when changing the chainwheel, it's definitely a 70's Rollfast. So maybe the original chainwheel was damaged with the chain guard and they changed them both. Herte's a Rollfast from the early 70's: