My birth year 16610 - what’s up with the dial?

[S1k]

I recently acquired a beautiful date year 16610. It has aged gracefully over the years and has some lovely patina to show.
I noticed that under the right light, and by really staring at the dial - there are some strange oddities.

Small black spots, some swirly marks under the hour hand...any ideas what these are? Should I be worried?

[Tools]

Looks pretty normal from here.

[Filipão]

Do you really own a 16610?

[springer]

Sounds like the old tropical sandstorm dial. Those babies are rare.

[S1k]

Here's the picture this time attached, had to crop and resize.

Notice this black spots around the dial e.g. by the 5 hour, 10 hour and in the center.

I can't tell if those are caused by natural aging, or is it water damage or oil drops?

[S1k]

Originally Posted by springer

Sounds like the old tropical sandstorm dial. Those babies are rare.

Not a tropical dial, although that would be nice!

[S1k]

Originally Posted by Tools

Looks pretty normal from here.

Picture attached!

There are some larger spots by the 5 hour, the 10 hour and in the middle.

[Goochy]

It looks like oil on the dial.

[Filipão]

Nice dail with tritium yellowish.

Do you know its recent service history? This to determine beforehand the possibility of being extra lube.

If it's oil there's a chance it might clean up, but take it to a good indy, don't risk waisting that gorgeous dial.