Timing Observations Between 3235 & 3285

[hl0m4n]

fully wound and time set to reference, i noticed a month or two later consistently my sub w/ 3235 always slow losing 2-3 minutes a month while my gmt w/ 3285 is consistently on point on the minute with only the seconds +/-.

i rotate between the two every other day and fully wind and set to reference again on shorter months requiring manual date change. i consistently noticed the same results between the two watches.

anyone else experiencing their sub consistently losing time compared to other- rolex watches in your collection?