That's a pretty common bottle, but very collectible because of its association with Dr. Pepper. That was the first company that bottled Dr. Pepper. 1900 is a good estimate for the year. I have one just like it... Nice bottle!
Probably that one... I don't focus on Dr. Pepper bottles specifically but I pick up the bottles that I like or know are rare. I have a few raised letter (embossed) ones... One with a misspelled town name.