md171:
Here are a couple of pics, showing the deferred-pay assembly in a Jennings "Operator Bell" series,
"Mints of Quality" model. You can see the three front mounted assemblies, where yours has the
open holes in the base-plate. These number bars drop, as apposed to the Watling & Pace models
shown above, which swing upward. You are going to have a tough time finding those missing parts,
as most were tossed by operators, and you don't usually see them listed on eBay. Keep an eye out,
as you never know, and now you know what to look for.
Also, that filled upper hole, and home-made metal plate, on the right side, definitely means there
was a side vender mounted at one time. You may want to get an original cover casting for the lower
vender hole, as it will look much better. I'm sure Dave Burten may have repros of it.
Bill