mazzer,
You you have a set of decals
like this one from Classic Parts of America ?
If so, it has decals for both the recirculating (same from 47-55) and fresh air heaters from 47-52 and 53-55.
If you have a cable control on a 1947 heater, there is only one decal, "DEFROSTER", which, I presume, goes on the dash above or below the knob for the defroster cable.
I'll look at some sales brochures to see if there are any photos.
Tim
