Need help with WWII Prop Hub ID

[Quest Master]

Need some help with this propeller hub identification:

It is 10.5" inches wide across the bottom and 11.5" inches tall. The only markings that I can find is a inspection mark: AK 138 or ^k 381 in circle on the bottom and a part number 5??770 (I can't make out the ??#).
This was found with a slew of other various WWII aircraft parts in a scrap yard. Could be U.S., but it also could be foreign made.
I've owned a C-45 prop hub...and it is MUCH bigger than that. I have also owned a B-24 prop hub and it is roughly the same size or bigger than that.
Can anyone tell me exactly what engine or aircraft this went to?
Thanks!

[Rod Schneider]

It is a propeller dome for a Hamilton-Standard prop. It contains the piston and cams used to change the blade pitch. It was used on many different airplanes, including B-24 and B-17. There are several different sizes depending on the specific model of prop it was installed on.....

[Quest Master]

Ok. Cool. So, I did a search on the Hamilton Standard Hydromatic Propeller, specific to this Propeller Dome, which is now the correct term I should be using. It would seem that Hamilton Standard Hydromatic Propeller was used on a slew of aircraft, but did they all use the same dome, just a different hub and blade assy?
Hamilton Standard Propeller Applications:
AIRCRAFT TYPE, HUB#, BLADE#
B-29 24F60 6521
AVRO LANCASTER 23EX 6519
B-17 F & G 23E50 6477
B-25 ALL SERIES 23E50 6477
PBY CATALINA 23E50 6353
A-26 INVADER 23E50 6359
VENTURA 23E50 6477
B-25 ALL SERIES 23E50 6359A
MOSQUITO 23EX 6519
A-20 HAVOC/BOSTON 23E50 6353
AVENGER 23E50 6359
DAUNTLESS 23E50 6511
F6F HELLCAT 23E50 6541
P-51 24D50 K6523
CORSAIR 23E50 6525
C-97 24F60 6521-6
C-54 23E50 6507
C-47 23E50 6477
C-82 33E60 6491
C-69 CONSTELLATION 33E60 6491
OS2U KINGFISHER 2D20 - CW 6167
C-45/JRC 2D30 - CW 6167
C-87/JRB 2B20 - CW 6135
BT-13/15/SVN 2D30 - CW 6101
AT-6/SNJ/HARVARD 12D40 - CW 6101

Source:
http://www.enginehistory.org/Propellers ... mstd.shtml