Dot Config On DJ Crown

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Took my vintage DJ 1601 (two tone) in for service. Reputable AD for several brands, said to use genuine Rolex parts. My 1601 crown is gold and has a line under the crown. Which I understand to be accurate for a 1601.

The watchmaker said the crown needed to be replaced, and the new crown is gold, but has two dots underneath the crown. I see conflicting things about the two dots online. But most often that the two dots mean the crown is white gold. But my crown is clearly yellow gold.

Any thoughts?
 
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The dots signify twin lock. Two for twin lock and three for triple lock is my understanding.
 
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It's a later marking for the twin lock crown.
 
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I had a two tone DJ serviced by Rolex watchmaker a few years ago. He advised he had to change the crown and the latest service items are now solid gold rather than capped so it wasn’t cheap.
It also had 2 dots.