just found this thread after listening to the pod cast - great work!
Here's a group shot of the different leg colours (IMO), all Hong Kong COO with moulded on the left and POCH on the right
the photo below shows the Euro 'PBP' pale and pink face variants on the right, and an example of a mix match legs on the left
a non-sonic welded one may be of use to you too - HK brown legs
Love the 31 back you sold - did you know it was a moulded legs too? As a final point the six sided buckle is the first release but also seen on PBP/POCH, and moulded legs all have these buckles (as do some painted).
Keep up the good work