You can try this test. I have an Exp 2 Z series having 3186 movement as well. If you still having problem and happened to nearby my place, i could run the test for you.
The Crown Method
Another method for discerning a 3185 with the 3186 movement is through the the Crown Rotation Method. This method is another way to discern the type of movement without having to remove the caseback. Because the calendar and hour-hand setting mechanism was redesigned in the 3186 movement, the number of turns of the crown to turn the 12 hour hand is different on a 3186 than it is on a 3185.
To perform this test, unscrew the crown such that the crown is in the hand setting position. With the crown face-up, count how many hours the hour-hand travels with one full revolution of the winding crown.
3185: one complete crown revolution makes the hour hand jumps 6 timezones/hours
3186: one complete crown revolution equals 8-9 timezones/hours
on the new cal 3186, the red GMT hand does not move much (aka 'wiggle') with the hour hand
on the old cal 3185, the red GMT hand 'wiggles' when adjusting the hour hand
reason being on the new 3186, the red GMT hand is shifted from the center of the movement where the hour,minute and second hands is attached, hence it is unaffected by the movement of the hour hand
on the old 3185, all 4 hands are attached in the center of the movement
Good info !
But missed the boat as watch was sold due to procrastination :/
thank you all for your input though..
The seach for a Z series with 3186 is indeed an exciting one
Patek Phillipe Aquanaut 5167
Rolex Daydate 18038
Grand Seiko SBGX 059
Seiko Premier Chrono Alarm
Seiko Pepsi Diver SKX009K1
Casio Illuminator A168WA-1U
whats are the significant diffenrence between thia two movements?
i know both have GMT and date, one is older and one is latest version.. beside that any expert can explain whats is new for 3186? my D series 16570 runs on 3185 but my cousin 16570 v series runs on 3186.
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