for fun - here are some pictures from all four -
This is the center - this is the oldest and has no half size needles. It also has a hole in the arrow. I've read this is to hold a spool pin, for thread to show how the needle threader worked.
This one has the addition of 20 1/2 needle - for the W&G chain-stitch machine
This one also has the 20 1/2 (though it does not show in this picture)
and it has stickers placed on it to "update" for the 2 1/2 size needle added - note the SewHandy name
This one has both 1/2 sizes
And SewHandy is now on the rim - Along with a lot of other "newer" machines of the time
