Do you think 4.7 in Mk VIII HA is a nice choice to use as Anti-Aircraft weapon?
Good - its about the right date for your ships 1920s (maybe a just a bit late ? what's the date on your ships 1918-25 ?)
Bad - its post AJA so would they get it ?
- Its not a very good AA gun due to loading weight making its rate of fire slow down.
I would go just a bit earlier and use the 4" (or earlier 3").