I haven't had much with #3, so I don't feel so dumb for not being able to ID it. This one, however, is more likely to make me feel sorta "well, duh!" eventually. Like #3, I'm not sure which way is up on the reverse, which is why I'm posting 2 photos with different reverse orientations. Is that an owl on the reverse? The letters should help, but I can't read them. Size is 13.2 x 14.1 mm, weight is 2.4g. Thanks for any suggestions that you might have.