If anyone is searching for a sample of 68 DT1 paint colour there is a NOS headlight bowl that could be used to match paint to.

eBay item number:125165818255

I bought one and it matched with my NOS 68 tank - I am not sure if it is the same gold used with the white stripe, maybe the black base makes it different.

 

The base colour shouldn't affect things .
The headlight shell won't have a Black or White base .
I have likewise some NOS headlight brackets , and a Shell / Bowl , for my DT1 B .
The colour is much more of an Orange than Gold , but close inspection on the underside of my paintwork on the bike ,
reveals how much they have bleached over the years .
Hundreds of years ago , when I was young , I had a nearly new DS7 , which sported the same colour paint .
On that bike , the colour was definitely a Gold tint .  There may have been some discrepancies with colour variations
leaving the factory . 73 RD 350 and DT3 Competition Green had a range of shades .

Thanks Swoop
I also have a NOS HT1 tank in 'Candy Orange' which from the doc attached is the same as DT1B and DT1S (although it doesn't look orange). It is a different colour than the 68 tank. Not significantly different - but it is different enough and appears the 68 colour has more depth and candy in the clear. The Ht1 tank doesn't have the same depth. The colour on the 68 looks more like the process/steps taken to paint California Orange. 
Wondering if your parts book have the part number for your DT1B headlight bowl as I have the part number on the box.
Colour variations from factory might also play a role.
Photo attached is in daylight - been raining for 3 weeks solid here so was taken a while ago.

The p/n for the headlight shell in my DT1 B parts book is 214-84111-61-52 .
52 is the colour code used on HT1 , CT1 C , DT1 B ,DS7 , XS1 B , and possibly others too .
If you're interested , I do have spare NOS headlight brackets for the early DT1 , in that colour .

My then bosses new december "68 DT1 was that gold colour. Much better looking than my Pearle White new one i bought in "70 as an old stock "69 probably, or was it a "70, still square arm & identical to his.