From what I understand:
3130 - Parachrom hair spring
3131 - Parachrom hair spring. Adds faraday cage for increased anti magnetic properties over the 3130
3132 - Parachrom hair spring. Adds paraflex shock absorber (in place of Kif) over the 3130.

 

Given the information above, this might support speculation regarding a possible upgrade in movement for the No Date Submariner from the 3130 perhaps to a new and improved 3230 movement and the Date Submariners perhaps upgraded from the 3135 to the 3235 currently used in the Datejust 41? OK I know this is highly speculative but just sayin' ...

 

Those improvements have very little impact on daily use. 3130 is super tough and proven so it doesn't really matter which one you choose.

 

I can't say what Rolex may do, although that it may someday add the newer shock absorber to the 3130 is a fair guess.

I also am coming to like no-date watches more an more. The date is a handy complication, but the dials look nice without it. I have an Explorer I.

 

I also have an 214270 Explorer 1 that I bought the first year it came out but am unsure whether it has the 3132 listed for the current 214270 or a 3130 calibre movement? After greater than seven years, my Explorer 1 runs +3 seconds per day since the day I bought it. My 114060 no date Submariner is less than a year old and runs +2 seconds per day. I am hard pressed to find any realistic difference in service of various Rolex watches I have owned over almost four decades. I will say I am a complete novice regarding the various Rolex movements, which is the reason I initiated this thread.

 

All the 214270 have 3132 inside.

 

That is my understanding as well, whereas the 114270 has the 3130 inside. All of the Submariner dates are shown as powered by the 3135 that I am told is the same as the 3130 but with date function. The speculation is that maybe all of the Submariner date models will be upgraded to the 3235 movement. If that were to happen, I wonder if the 3130 might also be upgraded to a "3230" that would be exactly like the 3235 but without the date function to power the 114060 no date Submariner. I realize this is all wild speculation on my part and will see what unfolds in slightly over a month's time. As I said earlier though, my predictions in the past regarding Basel and Rolex have been 100% - all wrong.

 

Good question, and it is good to know, considering that I have Watches with each of those movement in it.