The matching coloured date disc is a great touch. These late 60s / early 70s HFs had a few fume dials - this one with grey / brown for steel cases and a more overall brown fume for gold fill cases. Not many HFs about and very few fumes. Cheers.
And an Explorer too - the version with straight / non cathedral hour hand and a black dial - mmmmmm. If you like those Omega hands, then a Dynamic and some of their 70's chronographs also have them ;-) Here's a Xmas present I got for myself: And one for my partner: