Can't think of any models of EH Holdens - Trax would be most likely manufacturer if there are any. Streamlux did an FE Holden, which came to NZ and was then produced by Fun Ho! Fun Ho! also did an HT ute which is quite nice, and one of those funny Torana-based vans. The only other old Holden that isn't Trax that I can think of is the MB SF #60 which is an HX or HZ by the look of it.
The Dinky model from August 1963 was based on the Holden 'EJ' but did not have this cast onto it's baseplate only something like...HOLDEN SPECIAL SEDAN, please correct me if I am wrong, done this from memory as I don't have the model.