. There was I think an old Minolta 25 mm higher power binocular. There is definitely a Minolta zoom perhaps 8 to 16 times, which can be good. I cannot remember the exact specifications. Maybe 27 mm?
I would try the 16×25 Pentax. If possible I would try between three and six identical binoculars and choose the best one, even if it is the demonstrator in the shop. You should only buy the best one that you test and not an identical boxed binocular.
If you take this approach you can indeed find a useful 16×25. The problem is though holding it steady. You will need to brace it somehow.
Although most people say zoom binoculars are useless. This is not always the case. If you choose carefully.
One advantage is that the eye relief is often greater with zoom binoculars than a fixed magnification because of the way the optical train works. And at the higher magnifications, zoom binoculars usually have the greatest apparent field of view, often similar to the same fixed magnification binocular. I would definitely avoid zoom binoculars with greater than a three-time zoom ratio. Also a maximum magnification of 25 times for a small binocular and perhaps 35 times for a big binocular.
It might even be possible to find a decent unnamed 16×25 as long as you carefully test many examples and choose the best possible one. This is because they vary so much.
I would not buy the 16×25 by mail order. Except, and I have done this, is to find a very cheap price and buy six of them. The best place in the UK to do this type of thing is from the Daily Mail. They offer, or at least did offer, a £1 comprehensive insurance whereby you can return any item and get an immediate replacement by return of post the next day. No questions asked.
I bought 6 identical 8 to 24×50 binoculars. I tested them immediately and found that only two were out of collimation or otherwise not good. I got two replacements the next day, returning the faulty 2 pieces to the Courier who delivered the two new ones. They cost £12.99 each, when they were selling in the shop for £70. I then gave two away as presents. I hoped that they would break, but they're still being used to watch horseracing at 16 times magnification. Apparently, this is good for the far side of the track. If and when these two binoculars break I will give them replacements.
So if you see a 16×25 for say £12 you could try the same method.
And it is much better to go to a shop or Lidl or Aldi who have a pile of 50 of these and just go through them and buy the best ones you can at maybe £10 each. I think they both have comprehensive return warranties where you can get your money back, but you should check this.
I will try to think if there are any other small 16 times binoculars worth having a look at.