Vintage 123B dial question.

I’ve owned the 123B 3-4 times since the early 2000s when it came out. Every time I sell it, I end up regretting it and finding another.

Now I’ve landed a keeper.

Every other example I’ve had, and most I’ve seen, had more or less pure white luminous markers/hands.

My latest one however, has a decidedly warm tone to the markers, not unlike what you’d see in aging tritium. I’ve seen the same coloration on perhaps one or two examples for sale online in the past.

Does anyone know if B&R might have used tritium on these older watches? There’s no T on the dial, which I thought was required by law. Could they have used it early on and skirted the rule? The watch was originally sold in Asia.