I love that “boiler gauge” dial Datejust so much.
I found that the nickname came for its resemblance to a pressure gauge dial in the mind of some unknown collector.
I viewed it for first time in an old post from you and it kept haunting me till I found a two tone version some years ago and I jumped on it.
It is a reference 16013 circa 1986 with a dial that has turned creamy color.
I feel it is a very rare dial and very attractive.
Keep enjoying yours so much dear Mike!!
Best cordial regards
Abel