Here we have a trio of highly ornate matching design Keyhole Escutcheons.
These are decorated with circular vines and extensions for securing holes,
These do have some form of reference numbers on the back, hard to make out but on one looks to be 1022.
These are heavily gilt so unsure of the material underneath gilding, likely bronze or brass.
The Keyhole dimensions are height 17.80mm, diameter of hole 7mm.
Total escutcheon lengths 9.5cm, heights 6cm, distance centre to centre of fixing holes 6.70cm.