SR16 has a 43K resistor to VDD and 68pF cap to VSS.

I can't find any info on the display driver ICs used- they are labeled ITT 506-5N. I'm guessing they are equivalent to 75493 or 75494, but I'm not sure. So that makes tracing everything a little more difficult.

By connecting power to the LED board pins, it does look similar- digit 12 segment B actually lights up digit 3 segment G. I could not get digit 12 segment C or DP to light up, nor any other segments on digit 3. The other digits have all the segments, except digits 1 and 2 don't have DP.