An unusual ink sac

When I started to take apart this Eagle coin-filler, I knew it was in good condition. It was still a surprise to find that its original sac was intact, and of unusual construction.

Instead of being made with a molded end, this sac is actually a section of rubber tubing with a stiff rubber plug glued into the end. Not a very desirable design if the pressure bar presses evenly on the whole sac, but perfectly serviceable given the one-piece bar used here, which cannot compress the sac at its bottom end.