Could this be a HZ Sandman?

[Wombat7051]

Thanks for that, I take it that the 9942827 is the early HZ xu3 and the 92001123 is the later HZ xu3. So that is the same as the Hx xu3 continued over then.
On that two other questions, what year did the placard change? The second what do the two large letters on the bottm of the placard refer to? eg:Zl, Zh, ZC etc. Thanks