Based on the 2 brand / model, understood IW running on 21600 while Pam 312 on 28800.
Did homework BP seens to have some accuracy issue compared to Pam 312 (Both self winding)
IWC mentioned their torlerence level daily I suppose is +-0/7Secs. read up some review few guys have + 15 to 30 secs in a week. Is it normal as some who owned BP actually did sent into service centre for check/ service after few months purchase.
As with my budget, only plan to get either one of the above.
If were you, which one you go after? As the purchase are meant for casual wear, rool sleeve up or even weekends only.