Odd thing is I don't recall seeing the three hole bobbins on the Dry Z, only the Double Trick ..........
........... a couple of other odd items(1) both sets look like they never had covers (no solder evident) but (2) both sets do not have the tape completely surrounding the bobbins like original/uncovered ones that I have seen; both of these observations are unusual IMO .........
Oh well, whatever; over priced, over hyped, rare, who knows but the two sets I have sound pretty F - ing nice .............