245th or Grenadier Guards?

[cefguy]

To help me both understand and make the book project a more valid reference, I need some help.

First the question of whether a cap badge is 245thA or whether it is Canadian Grenadier Guards post WW1 cap badge. Is there a way to tell the difference, for example number of flames or shape of the flames?

The collars in brass with the brass overlay, were they used after WW1 or not? It is odd to put a brass overlay on a brass badge I would say.
Thank you
Don