Very nice, I too think it's grey, can look blue-ish in some light - in fact I think they only came in grey (anyone confirm??)
Aeroplane wings minute hand could be service replacement - maybe some experts on this model can confirm. Either way, very tidy.
Some more pics of that model here:

http://www.onthedash.com/Guide/_Chronographs/74.Silverstone/Reference_510.403/?show=11Silv5100.JPG

Stewart

: Hi

: Totally new to this forum and a bit out of my depth.
: Usually post on TZ and Purists.

: I jusr bought this piece from my dealer- liked it and condition
: looked great.

: It appears to be a silverstone from 1980's. Ref 510 .403

: Looking at the blogs, I note no comment about a blue dial but I
: suspect it must have come in black and blue.

: Thanks in advance

: Julian _ watch-guy.com