Hi people.I want to add to my previous post from the above date and correct a couple of errors.I recently discovered a build/serial number on the bracing between the soundhole and the bridge of my 52SGCS-6.#493.I also previously stated that I had purchased a DK-28-12 string from New Zealand since I was told thats what it was,in fact it is a DR-12-28.The serial being #S46806.To add to my tale I recently had success on ebay Australia and landed an 52SDM-12-5,as luck would have it,it was only 10kms from where I live and my bid posted with 3 secs left on the clock and I got it.After getting it home and looking it over I found the serial number of #496.This makes me think that both my 52,s were practically built side by side and yeah they are fairly low numbers.They both have the SIGMA symbol inlay and gold lettering on the headstocks.I believe that all 3 guitars have solid tops and suggest this is indicated in the 52 model codes and in the S***** serial of the DR-12-28.I also suggest that L***** serials may indicate laminate on other later models.My collection seems to be growing real fast at the moment as I am also holding 2 Tokai Cats Eyes with another in transit from Japan,as most would know Sig's and Tok's were all made at the same place and I have keen interest in both but am not limited solely by them.My luthier(another recent associate) and definitely someone I rely on at the moment says I have got G.A.S..............Guitar Accumulation Syndrome and you know --He's right.For anyone with guitar problems it's well worth getting to know a luthier or guitar tech.Most minor faults can be cured with a set up and it doesn't cost a fortune.If your guitar is not playable,its useless.Great forum this one and I'll be watching more often than in the past.Somethings got to keep me off ebay!!!!!!!!!!!!!!!!!!!!!!!!