Yes, they are good observations, and the overgather is certainly not typical of O.T. in my experience (albeit very limited), but the tail is only like this on some of them.
If you look at the picture I sent, many of them just have a single tail feather, and are pinched, not sheared.
I have pictured a few more, individually to see if this throws more light on the subject.
Two of those birds are actually Haparanda Glasbruk Swedish birds: 1st & 2nd.
One of them is of unknown origin, a metallic knobbly finish with pinched 'wings' on either side:3rd.
Nearly all the others are either labelled Taidelasi Oy and are from Espoon, Finland, or Art Glass Team Finland.
I bought the tiny white one from the USA recently, sadly, it has no label: 4th.