Motorization will put stress on this frame that it was never designed to handle. These bikes did not have a good reputation for standing up under rough usage. The same bike might have had different model names or finishes. Murray made different bikes for different retail outlets at the same time. If that's the model number it might be that the '140' on your bike refers to a chrome three speed Monterey and the '130' refers to a painted some other name. There is something that might be a model number in the picture '6-130X66 BOYS 26'. Squinting at the head badge in the picture just right might convince you that the head badge is a match. What we can see of the description indicates that there was a three speed made in 1966 but the men's model was metallic green - not chrome. Even cut off the bike's name looks like 'MONA -' rather than 'MONT -' Sadly, the page is cut off so that the model name is not visible. They also went to a 4 digit model number.įinding a 1966 Murray catalog to verify that such a bike was made took me to ' 1966 Murray Specials Catalog' at In 69, they changed the layout yet again. After these 3 digits was a 2 or 3 digit model number followed by and X and a 1 or 2 digit number that I will discuss momentarily. Some 65 bikes had an MO5 which stood for Murray of Ohio 1965. In 65 they were changing there serial number style and by then they were on the left rear dropout. According to a thread called ' Murray serial number project' on serial number 'MO6' indicates 1966.

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