I think the Walther 9 and it's clone the Bernardelli are a little smaller, but basically the same thing.
However, if you'll consider a revolver, the NAA 22lr fits in a watch pocket as well.
What I'm finding on the 'net says that the Walther's dimensions are : 3.93"L 2.76"H x .7"W
So a smidge shorter, and a smidge narrower, but also a smidge taller.
For the NAA I like the 22 mag - but it's a rimfire with all the reliability issues that come with that.
if your goal is to just be as small as you can, how about the life-card? They are certainly smaller than the baby browning. Less expensive too.
True. However, the lifecard is a single shot, and like I said the BB design is about the smallest MULTI-SHOT there is. Besides, this thread is about the 25acp and whether it is worthwhile. The 22LR is a whole 'nuther kettle of fish
