Centurys heat reflector ?

[Dawn]

I have two old centurys  , Which I bought  a few weeks ago both are model 100 Sept 1973 red ,green they dont have heat reflectors in them while my newer 1995 one does. Are they  missing ? And some of the centurys dont have dates on them is there a model number on them so you can tell? and does any one have a color chart for these lamps? Sorry about so many questions but Im a noobie full of hows and whys. THANK YOU FOR ANY HELP.

[Dawn]

Thank You, I will carry a copy with me.