C14 Corrector Plate AR coating.

I just acquired a C14 that was made around 1977 and the aluminum coarings are in good shape.

It does not look like the corrector plate has any MgF2 AR coatings (no blue or purple tone at an angle).

I think that this was an option at that time.

Is is possible to get the plate MgF2 coated by Celestron or a third party?

Thanks
John