thanks serpent
if 734 is aluminium, then (and because baches were almost all the time 300 pieces) then its obvious that I made 2 batches, so total of aluminium are 600.
Nope, I believe you are correct in the three batch statement and my #666 + #670 GGTS revision/version #2's back that up.
I got to thinking and that led me to the conclusion that #734 is in fact an aluminum GGTS without nickel plating and that the listing is mistaken.
Of course I could be wrong, but, we have had that mistake made here before in the misidentification between the two, actually.