Got a derby and a??? What years are they?

Sep 2, 2010
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elkton maryland
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Got the first bike today from a buddy clearing a lot I think it's supposed to have a tank. It's a derby. Cool kinda loop frame rear. Chainguard seems wrong. Anyone know the year? The other is spray painted over badge that's just square and nothing on it. My buddy pulled it out of a scrap dumpster for me.I put the wheels and bars on it just because I had them. Also wondering the manufacturer and estimated year. Maybe possible values I'm into both of them for exactly zero dollars so I think I did ok.
 

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Jul 16, 2019
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America's Friendly Hat
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Found it for you, here of course! Colson Derby
 
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Jan 21, 2009
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Zambales, Philippines
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Mid 50's Murray Aeroline:
1603255866082.png

The serial number should show a MO with the third letter the year. MOP is 1950, MOQ 1951, MOR is 1952 etc to the late 50's. Then it's a little different.
 

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