:I think also that Class II xfmrs are inherently protected against a short or overload due to the winding impedance. So, they don't have to be fused (e.g., doorbell xfmr).
:Doug
Sir Edd:
I believe it was the very first Princesses that had the #47. It had a short life span, and later they did change it to an easier to replace bulb, but they used the same transformer. All telephone people Hated the Princess phone, be it installing the thing, working on it or whatever. Most customers hated it too, because when you dialed a rotary dial, the phone spun around on the table. Things got better with Touch Tone, but the princess was a pain to install, repair, or use.
Lewis
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Robert 
Bob Masse 