A lot of "prototypes" are created, especially the RPR guys are great with them. Just search for the PanAm Daytona.. Also the above build should be possible, as mentioned above 1680 comes in gold (nipple dial). If you don't care about the engraving which will say 1680,all the modder needs to do is fit a 5513 dial and a 1520 or 1530? The case should take it. But is a bit silly when a 5513 is worth less than a gold 1680,but again is fun I suppose. Sent from my SM-N930F using Tapatalk