Fully keyed chanter with stop valve - you don’t see that too often with practice sets.
IIRC, this set was offered on eBay early last year and went for approx. $1,200. Either it was this set or a set identical.
The set on Ebay is another practice set. I’m the proud owner and struggling newbie with the set that sold back in September. Both sets are identical though…mine was in mint condition! I think I’ll watch to see what this one goes for.