Another Pulsar from the same era as ZK-RUS was ZK-KEN (c/n 345) which was built by Ken Rogers of Christchurch and first registered on 04-08-1995. Below I offer three shots of it
Below: From the other side as seen at Taieri on 13-12-2003.
Below are three views of ZK-RUS in its earlier scheme.
Obviously this representation (or lack of) of the registration letters was acceptable at these dates.
So have the rules changed since then ?
From memory the other Pulsars had side markings.