This was one of three RDV-006 varieties found in the same box, with the other two being 2000-P WAMs. This one is obviously the far rarer variety, and the first 1988 reverse of 89 I've ever found. Got super lucky with the condition too!
My cellphone camera is damaged, so the full coin photos are blurry, but the relevant details are shown under USB scope and should be very clear.