Traditional watch sales and Fitbit (NYSE:FIT) numbers offer clues into how many Apple (NASDAQ:AAPL) watches have been sold. Apple has kept the number of its smartwatches sold under wraps, but Bloomberg estimates the tech giant has sold at least 1.9 million time pieces since their debut in March, based on reported revenue from the unit. Traditional watch sales could also help estimate the number of watches sold. June watch sales fell 11% vs. a year ago as retailers sold $375 million watches, according to the NPD Group. "The Apple Watch is going to... More