Good eye... and I totally don't remember reference numbers and had to look it up. The blue is reflection from the anti-reflection film on the crystal. The strap is an IWC strap but for the life of me I can't find the strap info. Let me ask the AD I got it...
The strap is from the latest simple Miramar pilot. Hodinkee also had it on their ceramic version. It measures 20x18 and I have one on my GO. Great strap but wears kinda quickly at the keepers. ...