Hi Furmanjr,

The serial number format is possibly Merida of Taiwan. Some Mongoose BMX bikes have this format.

The BMX serial number decode site: Vintage mongoose: Serial #

So "M"=Merida, "6"= 1986, 1996, . . . "L"=December.

So the frame was built in 1986 or 1996 for the next years model, 1987 or 1997.


I have seen a Shogun Sport model with a "Made in Taiwan" decal with the same format of serial number: M6-Lxxxx.

It would be nice if you could post some pictures.