Having owned the 42mm OVM Maxi LE and now the 39mm the only difference of any importance to my taste is the crystal. I really wish they went with the domed hesalite crystal in lieu of the ar coated sapphire on the 39mm. The OVM Maxi LE just oozes vintage created by the warmth of the crystal on the faux patina markers/hands. Speaking to the hands on the 39mm, I don't find them to be too large for the smaller dial, in fact to my eye, they look in proportion to the size/length you see in the similarly sized Rolex Milsub, which was of course the inspiration. I've been wearing my 39mm for a week straight now on an Erika's Black Ops strap. Beside being comfortable as all hell on my 6.75" wrist, the watch gains less than .5 sec/day.