Info wanted on Avro 627 and 642/4m

Hello,

Interested modelling the Avro 627 mailplane that flew a couple of years in the UK and Canada. Also interested in the Avro 642/4m that went to india as a transport for the Viceroy named the Star of India.

Now, I have some questions about these products of Avro:

-What was the color of the trim and registration on the 627; the plane was apparently yellow overall.
-Collors of the 642 ? ; seems silver overall, but might be something else…

Also, I am very interested in good quality pictures of these planes, what can be found online are relatively small pics. So far I only have the Flight material on these planes and on the 627 the Putnam 3view.

Thanks in advance!

Roel