As John says, no such thing as an RPM on coins later than 1989. Any doubling on the mint mark of a coin 1990 or later would be a DDO if anything at all. My guess would be MD on this one as John said, but possibly a little DDD as well.
My best finds:
1996 DDO-001/FS-101: http://goccf.com/t/372066
Two 2000 WAMs in a box: http://goccf.com/t/375240
1995 DDO-001/FS-101: http://goccf.com/t/376071#3225244
1996 DDO-001/FS-101: http://goccf.com/t/372066
Two 2000 WAMs in a box: http://goccf.com/t/375240
1995 DDO-001/FS-101: http://goccf.com/t/376071#3225244