1938-40 Slingerland 5x14 Nickel Over Brass Artist Model Radio King

Hi all,
I got this snare drum at the 2014 Chicago Vintage Drum Show. A special thanks goes to Mark Cooper for assisting me with the purchase and with some additional information as to what this snare drum is.
 
1938-40 SLINGERLAND 5 x 14 NOB ARTIST MODEL RADIO KING
 
The SHELL:
 
Nothing out of the ordinary here, just a nicely preserved nob shell that just needed a good cleaning. Simple Green (full strength) works really well.  As the photos show, the shell is a lighter weight one-piece brass shell than the heavy 2-piece and one-piece brass shells that Ludwig & Ludwig used in the same era.  
 
The HARDWARE:
 
Again, nothing out of the ordinary here. The nickel plated hardware was in good shape but still needed a good cleaning and polishing. As always the steel tension rods show the most wear but they cleaned up and polished up nicely. The top rim has a strong Slingerland Radio King stamp.
 
Radio King logo top and bottom calf heads and of-the-era Slingerland snare wires rounded out this restoration
 
Final thoughts:
 
This snare drum was sold to me a Radio King. As I started to get into the restoration I noticed that there are no extension brackets or any drilling for extension brackets. I have seen catalog photos of Slingerland Radio Kings with no extension brackets but a few possible scenarios still remain: 1. With the WW II War Act (metal restrictions) approaching along with the dwindling metal parts situation maybe the extension brackets were left off on this drum. 2. Maybe this was a special order a la Gene Krupa where the buyer requested no extension brackets. This is quite possible as drum companies of that era would entertain special orders or “factory re dos”.  And, just keeping it real... 3. There is also the possibility that I got ripped off this time.
 
As always feel free to weigh-in with your thoughts and experiences.
 
Enjoy!