Hahaha....Ghostrider, YOU forgot the L13 and L14 that also came out in the Datsun 1600's obviously they werent called 1600's with those engines, they were called Bluebirds.
The L13, L14,L16 and L18 didn't have the "B" designation, either.
The earliest L series you will find would be a 1968 model as they were released in 1969.(Obviously they were being built before they were released)
Odd that his site is based in the netherlands too.....(or appears to be)