For your consideration, here is a Vintage Aluminum Teapot Infuser, Acorn Shaped.  It has some wear and a few small dents on it.  The lid threads on and off okay.  It measures 2 inches tall and has a diameter of 1 7/8 inches at the top.  The chain and hook measures 3 inches long. 

It will be mailed in a box for protection.  Item pictured is the actual item for up for sale and comes from a non-smoking household.  (667.8b24a-.5kx1)