Help Identifying SWB frame

[Greasey Harley]

I don't know what the year is, but If you're piecing a frame to a cab, I recommend getting documentation from the DMV or State Police.
Every place is different, but up here in Kootenai County, ID, Vehicles being transferred from out of state are subject to a "VIN inspection". They WILL check the vin on the frame and if It doesn't match the title, they are likely to IMPOUND the vehicle (at the owner's expense) until it's figured out.