This question is probably not Steinhart specific, but it is a Steinhart watch. I have an Ocean One GMT with the Sellita SW300-1 movement. If I let the autowind do it's thing, the watch will speed up quite a bit over a couple of days meaning (as I understand it, no expert) that the mainspring is winding down too much, ie. my daily movement isn't enough to keep it wound.

HOWEVER, if I wind the watch 10-20 turns every moring (and I do), it keeps within +1 to +2 spd (really very good) and I…

SW300-1 (Ocean One GMT Coke) Speed Up if Not Wound