I used to buy decommissioned MoD watches from a division of Anchor Supplies and got quite friendly with the staff. One day I received a call from the supervisor asking my advice on a watch they just received in a parcel from the MoD. Yes you guessed it, it was a yellow dial "Vulcan" Seiko.
I had only seen one before and that was new old stock in a plain brown cardboard box with a military stores label and the watch was wrapped in waxed paper, no NSN on the case back. I could have bought this one for £250 in 1999 but I declined as the Seiko RAF chrono could be quite easily found for £100 at this time.
Long story short, the Vulcan Seiko from Anchor Supplies made over £700 on eBay in 2003/2004.
Eddie