Since the B series can be somewhat of a transitional series for PAM's, the 029B could have either a T Swiss Made T (Tritium) dial or a L Swiss Made L Lumi dial. Yours is market L Swiss Made L at the bottom so should be straight C3 if you want to keep it Lumi.
I turned mine into a T Dial by having Ziggy change the L's to T's and lume in his Vintage Tritium mix.
Personal choice
Here is mine, converted to a T-dial by Ziggy
Come on., let's see you in the suit
I agree. I wear my White Dial VC Overseas or a White Dial Pam with a Suit often....
I also now wear my Franken Explorer with a suit or dress shirt
That Discovery looks great!