Hoo sorry, my mistake !
I remember I have just seen the light brown dial on their internet site, that's why...
The gilt of your photo is absolutely stunning ! This early series often goes to "silver" through the time imho and this one is wonderful
By the way, I have a friend who has question about explorer 1.
Especially the ref 5500 and 5504
About the 5500 he ask of it really existed with an explorer dial, he has found nothing about.
And about the caliber of both, he thinks 1520 for 5500 and 1530 for 5504 but is not sure.
About the 5504 he ask about the diameter?
He read 34.5, 35, 35.5, and 36 most of the time.
He is a bit lost on these uncommon explorer.
If you know something, don't hesitate to share.
THanks for your help