"Pinched In" Victorian Shakers

An interesting thing about pinched or pinch-in shakers is that in addition to a shaker taken out of a mould, there is some addition of hand working done to the piece.

They seem to have their own character within the shape that is created by the pinched-in shape.
They seem to be found in many kinds of art glass and made both here in the US and in Europe. Were they made strictly for design or did they provide better grip for the piece in which to use.
I have found in my experience that all seem to have two piece tops. Is that some indication of the time frame that they were made in?

What ever one may think they are unique in their own right and each has a character all their own.

I have found that this form is relatively hard to find compared to other shapes. I’m also not aware that any that were found in any kind of original holder as a set nor any matching mustard jars.

They are found in many types of art glass that include cranberry, amberina, tortoise shell, and opalescent glass.

This form is one of my favorite types of shakers and I’m always looking for more to add to my collection.

Should anyone have any additional information I would love to hear from you such as the existence of mustard jars and sugar shakers