Well looks like someone liked the colour Blue.The old green you asked about looks to be a Model 5 Speical series 3.The model 5's ran from 1957 to 1960.
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Seeing as it is the series 3 it would have been made in 1959 to 1960.The engine number shows that it could well be the original engine.There is no original documents to prove the engine numbers from that era,but from other collectors findings and expertise it has been found the series 3 numbers did in-fact start with letters.
All in all though very good finds you have got there. congrats

Here for a good time,not a long time.