Is it an early gusset one or the later cali style frame Matt 
Cali style mate
Probably not as valuable/desriable as the Gussett ones but very nice all the same
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John's probably the guy to speak to re value but i'd have a guess around Cali money
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He has built two and there both stunners
1983 Blue Max1983 Blue Max F&F (original chrome, new decals)
mongoose stamped stainless steel bars
mongoose gold stem with original decal
mongoose motomag II wheels (polished)
NOS Early logo cheng shin skinwall comp III (thin/thin 1.75's)
NOS Kashimax MX seat
mongoose stamped seat clamp
mongoose SS seatpost
mongoose stamped snowflake chainwheel
unstamped mongoose crank (original to F&F)
NOS Union rat traps
mongoose stamped headset
mongoose stamped BB
mongoose grips
Dia Compe 890/1020 calipers
Dia Compe Pre-bent levers
NOS Genuine Tuff Pads
NOS Dia Compe Cables
NOS Dia Compe Clips
NOS Izumi chain
Iron Cross dust caps
One of a Kind custom blue max vinyl pad set.
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1984 blue max1984 mongoose blue max F&F original chrome & original decals
mint Pro-Class bars (cali size)
mint Pro-Class ACS stem (original finish - not polished)
very nice survivor Pro-Class wheels on SR hubs with original spokes,rim tape & decals (original finish - not polished)
NOS Knarler Knobby's
mint Dia Compe MX900 calipers
mint Dia Compe Tech 3's
NOS Dia Compe Cables & Clips
NOS Skyway Tuff Pads
NOS Kashimax Aero
NOS KKT AMX
NOS Takagi Spider & chainring
NOS Izumi Chain
mint Takagi unstamped OPC (original to bike)
mint Tange stamped BB (original to bike)
mint Tange stamped Headset (original to bike)
mint Cr-Mo stamped seatpost
mint MX hinged clamp
new mongoose grips
iron cross dust caps
custom Blue Max padset
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I've got one of these with the gusset. Am I correct in thinking I need the Cali style forks? Nice bikes
Yes
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see above pics