I contacted the seller about that pipe when he first listed it, as the 1916 date didn't jibe with his description of the pipe's construction. I'm guessing 1896 is more like it. It's a small pipe. You're correct to have suspicions about that stem. I don't think that it's original. And, it's chipped.
The bid history is fun, with two eBay noobies playing "climb the trellis" with a series of tiny advancements. They seem to be intent on getting the object of desire for the least amount possible. The result is predictable. Neither of these toddlers gets the bottle. Someone swoops in at the last second and grabs the prize.
Overall the "winner" didn't pay a heck of a lot for it, but probably the lower end if the stem is original and if it is unsmoked. If the stem is a replacement, which I'm reasonably certain it is, the genius sniper screwed himself. Seems fair either way.
So what is a cased unsmoked Barling in perfect new condition (which this pipe isn't) valued at? Whatever the market will bear, but the market will bear about $200 per inch, plus extra for the case. For the most part the really fine pieces don't show up on eBay. They get traded privately.