Ken commented a couple days ago on knobs he is seeking for his Philharmonic. He referenced a recently posted photo showing the round brown bakelite. This photo also showed the cast metal lever knobs for the band switch and volume control.
A review of various photos in Scott News and Scott price lists, as well as photos here and elsewhere, shows the variety of knob style alternatives Scott supplied for those 2 controls over the years. There is the brown lever bakelite with set screw. And the round "pinched" shape brown bakelite preferably with a set screw, also seen on the Sixteen. And the cast metal one. See photo of my specimens. I regularly see the round and pinched style (preferably with set screws) at swap meets in the stock of knob vendors, but not the cast metal type.
Chronologically (from Scott literature Photos I have) for the Philharmonic band and volume controls:
first the pinched, then metal, back to pinched and towards the FM/AM era, the bakelite lever, but sometimes the pinched.
The other control shafts had the round bakelite style. For the low speed tuning knob, there was sometimes a shallow round and sometimes the standard round brown bakelite knob.
Both Norm and I have encountered a octagon shaped knob set on a later BOL Philharmonic. That may indicate that Scott bought knobs in moderate quantities and perhaps had to settle for another style.
Page 13 of my Pointer Philharmonic Owners Manual shows wood knobs like the AW-23 and Fifteen, but the manual cover photo shows the bakelite round and pinched style as does the cover of the April 1937 Scott News announcing the new Philharmonic (Vol 2 number 10). However, I am unaware of any Philharmonic example equipped with the earlier style wood knobs.
The 1937-8 Sixteen (and Eighteen) seems to be the only other model using the round and pinched bakelite style.
Incidentally, I have not found a promotional photo of a Philharmonic with the wood 'S" knobs that Scott supplied supplied with the contemporary Phantom, Super XII, Masterpiece and Laureate.