Noticed since letting my PRS-47 stop while giving another watch wrist time then restarting it, the loss of time per day has increased from its initial -5 to -8 seconds per day to -13 plus, which I believe is more than the manufacturers specification for the Miyota 9039.

However I've read this is measured from a full wind via the crown but on giving the crown a carful wind I've not been able to establish what a full wind is. Apart from the usual gritty feeling the resistance to winding doesn't seem to change, so stopped before I broke it.

Anybody any advice/thoughts?