How can one tell the difference between gen and repro cases?

[memorymoog]

Some of these cases coming out of Vietnam are looking pretty damn good... how can one spot the difference?

Very curious to hear thoughts on this matter.

Thanks in advance!

Edited February 8, 2010 by memorymoog

[freddy333]

Some of them are outstanding - nearly 1:1 copies, so differences may be difficult to spot, especially for those who are not intimately familiar with the gen. Typically, incorrect/duplicated serial numbers (you will need to research gen serial number vs date of manufacture online) or the lack of a (natural) patina are give-aways.