This is a FEDERAL case stamp for distilled spirits that happened to be used in Kentucky. This one was for 12 bottles, there are also case stamps for 24 and 48 bottles, and possibly others. Originally there were other parts including the bottle strips attached in a vertical format. There is also a 2 4/10 gallons value.
Lot 2528 in this sale from the Tolman collection shows the format:
http://siegelauctions.com/dynamic/l...&sale_no=934