I’ve replaced the band once (friction pins) and the battery several times. I have to remember the back is not a pry open, but a twist. Large needle nose did a good job, firmly seating the tips in opposing notches. Battery = 395 / 399. $7 at Walgreen’s. Won’t do that again. Amazon.
I noticed that some versions of this model have a 23 and 13 flanking the Swiss Army at 11 and 1.