OK, I'm finally convinced it's a Dulite finish. Thanks to Keith & Johnny's photos, and a side by side comparison with a friend's RR #129xxxx, I 'm about as certain as I can be that the bluish tint is apparent when next to the parkerized finish. I'd appreciate further comments if the attached photos help. Mine (Dulite) is left hand/bottom pistol in the pics.
Serial # 1021615 seems a bit late for a type 2 Dulite, but that's all I can come up with.
Again, I appreciate the assistance you folks have given.