Bulova 1929 Senator

I recently purchased this watch as I have been watching it for sometime. I believe it closely resembles that of a 1926 Executive, hand carved, 14k solid gold. However, a couple things throw me off. One being that the inside case back has a date of 1927 and the movement is a 15 jewel. The ad for the 1926 Executive says it should have a 17 jewel movement. The hands aren't original, the dial looks pretty good, may be a relume. The case overall is beautiful! I love the hand carved look of it! But I need help making sense of it all. I hope you al l can help! Unfortunately the seller's photos don't show the movement date code.