That's absolutely a Rickenbacker. It's all over that album.
Have a listen to Cygnus X-1, long bass intro!
Geddy didn't start using the Jazz until Permanent Waves (it's on The Spirit of Radio) then on Moving Pictures and Signals it's about 50/50 Rick and Jazz.
It's easy to tell the difference on Signals but on Moving Pictures Geddy used quite a different bass tone with a thick, chewy distortion, so it's not as easy to tell them apart. Also on MP Geddy only used the neck pickup on the Jazz so the distictive hollow twang isn't there.