It certainly looks similar to the 1350. I did speak with a guy who's pretty sure there was a 1500 but we just can't find a pic or any info. And there's a few references to the DM1500 on the internet including a company selling a service guide for it. One website of some old DJ saying how great the 1500 was.
I think we've narrowed it down to the 1350 or 1500.