The second image was the first try to immerse a display into polyester resin, because of the resin can reach high temperature while curing, a LCD is not the better option. This clock was made with an OLED display.
The rest of the images show the process.
After the resin is cured it must be polished.
The electronic was soldered "on the air". The components are:
real time clock PCF8583
battery (3V) CR2032
display 128x64 0,96" OLED DISP