I have no idea what those two extra holes are for. I'm guessing that, like the serial number, they didn't come from Warmoth.
The brand in the body is not the old-old one I mentioned with the turtle's body filled-in. It's just the kinda-old one where the neck is crooked, and only the strings are filled in.
I checked on the v-shaped carve on the neck heel, and found we used to do it that until sometime in the 2000's, so I'm guessing that's when this neck is from.
A solid Brazilian Rosewood neck, you say? Was this info from the person you acquired it from? The CITES ban on BR was in 1992, so something about the dates seems off. I don't feel like the neck is that old, based on the brands, and the fact that it is marked as having stainless steel frets.
BUT....as this thread shows, it wouldn't be the first time I've been wrong today.