Just to keep it updated:
1000443: a306 | US | Best buy : issue
1000613: a306 | YY1301B1 | Black | US | sony.com |
REW Graphed : issue
1001704: a307 | Japan | eBay | REW Graphed:
no issue
10033xx: a306 | Japan | eBay | REW Graphed :
no issue
1003647: a306 | YY1301B1 | Black | Japan | Amazon.jp |
REW Graphed :
no issue
1005860: a306 | YY1301B1 | Black | Japan | Amazon.jp | REW Graphed : issue
1006471: a306 | YY1301B1 | Black | Japan | Amazon.jp | REW Graphed :
no issue
1100033: a306 | YY1301B1 | Black | UAE | Sony Store | Graphed: issue
2000246: a306 | YY1301B1 | Blue | Japan | eBay | REW Graphed : issue
20037XX: a306 | ? | Blue | Japan | ? | REW Graphed:
no issue
3000045: a306 | HK | DMA Store | issue
3000108: a306 | YY1301B1 | Gray | Japan | Masterteamhk : issue
3000840: a307 | YY1301B2 | Grey | Japan | Amazon.jp | REW Graphed :
no issue
30039xx: a306 | YY1301B1 | Gray | Japan | eBay | REW Graphed: issue
5000078: a306 | YY1301B1 | Black | Singapore | REW Graphed :
no issue
2001129: a306 | YY1301B1 | Blue | Japan | Bic Camera | REW Graphed :
no issue
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Unrelated but for people interested in the official case for the a306/307, I got it from
AliExpress for 44AUD/29USD (currently unavailable), and from what I can tell, if it is not the original it is very close to it. Checking some reviews from the original Sony store on Ebay jp I can see a lot of people complaining about it not being the best quality product Sony could offer for the original price, so I'm more than happy to have only spent half of the price of the original.