[Bill Murray]

I cry foul Keith!!!

We are getting our share of Hurricane Ivan and our power went out at the store before I got to post an answer.

T'would be a 30 by my reckoning. Is that a post war rego?
Doesn't look all that original to me but then I know a lot less about CMP vehicles than the modified conventional ones.

David, according to period catalogs I have, we agree on most points on 1939 vis a vis 1940 models. Just a further comment, on the 1939 grille the word Chevrolet was indeed painted red but was rather smaller than the 1940 script. As well, the 39 had a stylized band on either side of the script whereas the 40 had just a little line on each side.
The 1939 grille had 17 horizontal bars which were unpainted.
The 1940 grille had 14 horizontal bars, thicker than the 1939 and with a red stripe in the middle of each bar.

As you point out, military deliveries would most likely have had the grilles, bumpers etc. painted instead of chromed and "striped".

To go back a year, here is a Swedish "umbaeuwagen" used by the Swedish Red Cross in the first Finnish war. Sory, the text is mutilated but it was converted from a bread van.
Bill