simple air-king question

[ayres]

hi all, i've been exploring the air-king market recently, and i would like to know more about the recent production history. i understand that the '10' tacked onto the end of the reference number indicates an engine-turned bezel, but what is the difference between the 14000 and 14000m? does the 14000 have the 3130 movement? years both of these two references were produced? i'm assuming the 'm' indicates merely a modification to the movement - similar to the 14060 vs 14060m. right?

i had been doing simple searches for these answers, but i cannot seem to find anything.

cheers,