There are a couple of easy tells, more obvious than a Fender (there are so many variations in Fenders, "upbranded" Squiers, fake decals); I don't think there are any factory fakers which are an exact copy.
The current Chickenbackers are an easy spot - they are a different scale and the bridge is wrong.
There was a site, joeysbassnotes.com, which spelled it out, but it appears to have gone off the air.
Here's some of mine:
A Hondo II and a CMI(?) Japanese I'm currently working on:
Both have single truss-rods, the Hondo's treble pickup is in the wrong place (ignore its bridge, that's a Hipshot), the CMI's machines are standard Japanese (the Hondo's machines are replacements), the Hondo has a bolt-on neck, the jack sockets, the strap button position, the split-shaft pots and push-on on knobs.
These are the typical Japanese machines.
A nice Shaftesbury I sold.
The Shaftesbury is one of the best ones, with a thru-neck. Note the same machines. This one has a real Rickenbacker bridge/tailpiece. From a distance it looks right, but up close it's like Joanna Lumley wearing makeup. The weight and general feel are wrong. Only 1 truss rod.
The back of a bolt-on neck CMI with wavy non-Grover machines which I sold.
No 4001/4003s have bolt-on necks and those machines are unbranded. The skunk stripe is too wide. The strap button is usually in the wrong place.
Some have shonky treble pickups, like this Diamond (Aria) branded one; this was my 1st faker, which I sold on.
The finished Diamond.
Replacement machines' posts too wide, strap button wrong, wide skunk stripe, bolt-on neck (notice the stripe isn't full-length), jack socket says "Stereo Sound" not "Rick-o-Sound".
And here's the above CMI (4001 copy) alongside a Rickenbacker 4003.
Skunk stripe, machines, pickguard, strap button, bolt-on, position dots for control knobs. (The neck pickup position is OK - that's a 4001/4003 difference.)
Just like with any copy, they look fine from a distance, but a little bit of sleuthing and you can pick out the details.