rare vintage throat medical ice bag flexible pliable rubber davol rubber company

Description

rare, vintage, round medical throat ice bag.
pliable/flexible, davol.
Made of what appears to be leather like rubber, in chocolate brown.
Has a metal screw cap.
at a central point it can be pulled apart, and expands to fit around the neck.
In original box shows overall wear, see scans.
with  the Davila logo on the bag.
printed on box: cloth inserted, not sure what that means.? there isn't a cloth insert??
I’ve never seen a throat ice bag like this before.