This Frame is solid-thick tubes all around. The bottom bracket/downtube gusset was eliminated around Feb/March of 1977. Mongoose bmx two gusset frame, this has the coaster brake tab, and no caliper brake bridge, an early Mongoose frame indeed! You will also get a sticker set with this frame, (for your show quality resto!)This was the last year for the two gusset frame. I'm not a serial number expert, I just look at the beauty of the old school bmx frames and go from there. Sorry If I confused all you collectors out there. ![]() So the "7" behind the CA makes it a 1977. the "A" for production month of January.Then the five digit serial number below the CA7. ![]() I've had a lot of questions regarding the year so I checked with some of my serial number experts, and they think a very, very early 77 made frame. ![]() 1977 Serial number starts with CA7 then five digit number under it starting with 31#. Item: 113598187217 Mongoose 1977 OLD SCHOOL BMX FRAME two gusset frame.
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