Here is the bridge intonation datum with heavy bottom medium gauge strings, medium string height action and commensurate neck relief. Keep in mind that intonation was not that big a deal back when this guitar was made, especially for lower market guitars, much like most acoustic guitars even today. Few guitar players even knew how to set intonation back then. Also evidenced by this bridge's string slots being cut perpindicular to the sadlle's centerline, and not aligned with the bridge being slanted for intonation, and the bridge being glued down even farther forward than the treble end of the bridge in the picture here.
Notice that the bass side of the bridge base plate is off of the pickguard at it's intoned spot. I might have to put a small, carved, aesthetic support block under the bass end of the bridge base for a good solid footing for the vibrato, but maybe not, we'll see tommorrow when today's work sets / dries. See next pages showing the bridge datum marking, bridge plate tape installed and being secured in place.