Hi,
there's some pretty interesting info so far in this thread about Sigma guitars, that's for sure!

I hope one of the experts can help me with the following question as well : I've got a GCS-6 (bought for approx. US $90) since last year, and its serial number is 6260;
Based on this serial number (plus the fact that it has the original "Sigma" logo in gold block letters) I'm assuming that it must have been made in Japan in the very early 70's, however what confuses me is that it does NOT have an adjustable bridge, which apparently all of the earliest GCS-models by Sigma should have...

So, is there any way of finding out if my GCS-6 is a really early model, or is it simply a fact that the serial numbers of those Japanese-made Sigma's from the 70's don't have any real consistency?

Thanks for your help!