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Mongoose Bike Serial Decoder Diagram

1st of all you need a photo sizing program. serious.
Secondly, it looks like your building a 1978 model like the John George ad. If your frame is a '79 your looking for a totally different build, see my catalog scans in the museum. A '79 model has annodized 7C's, annodized low flange Shimano hubs with cassette rear, matching red or blue fork, Mongoose suede saddle, MKS BM-1 pedals, Mongoose headset, blue alloy bars and Mongoose shinwall snakebellies.
To properly match a 1978 Team Mongoose like the John George ad and the 1978 catalog you need need MKS BM-1 [again], non logo suede saddle, blue alloy bars, DeCoster fork and believe it or not, the 1978 catalog Team Mongoose has a Motomag decal on the down tube.
Mongoose didn't issue any stamped products [not counting pads] until 1979, then came grips, seats, headsets, bottom brackets, seat clamps and tires.
Team Mongooses came with 39t Shimano rings, both years.
We've talked about the fork already, but that fork looks to be a later model, like 1982/3 when they were putting the red or blue over silver powder coat instead of over nickel, your fork doesn't appear to match your frame shade.
Is the Shimano lever straight or pre-bent? Looks straight, need bent.
What are the date codes on the shimano products, hubs, brakes, cranks? I have the date codes if your as picky as me.
I'll finish with this, I love that bike, as I said I'm building a 1978 just like John's in the ad. I lusted over that ad in 1978/9 like nothing else, I finally got mine in '79 but I always like the 78's better, now I have one. I'm only being picky because I'm nuts about both years, yours, like I said is kind of a cross breed between the 78 and 79.