The seller just got back to me with a couple details. The SN is 276621, which puts the manufacture date at 1930. It's in very nice condition. No case is mentioned, but there is only one photo and no long description - maybe one is included (UPDATE: a leather gig bag is included). Here is the seller's description of the horn:
Starting bid is $2,000 and the Buy-it-Now price is $3,500 (probably a good price for this horn).Excellent condition
Used extensively and professional during 60's and 70's as concert band soloing
SOLD FOR $2,000 - GREAT! CONGRATULATIONS TO WHOMEVER WON
https://www.ebay.com/itm/234527207883
The seller sent me these images: