I think the one top-right is your model.
you can see how the clip is used.
later ones had a rubber seal puts reflector and glass together before you place this assembly in the rim.
Earlier there was a paper gasket thinghy..
I think the rubber seals are postwar? correct me please.
Again I have no idea what is original but I have found that standard W clips did not hole the 3 pieces together
They seem to be too short to put enough force on the refector
I bought some bulk O ring rubber and made an O ring to fit inside the retaining ring
Then the glass ( frosted bathroom glass ) then another ) ring then the reflector
If you have it apart, take it to a plating shop & get it replated with bright silver , very much worth doing .