It’s always a guessing game trying to figure out how many Kindle devices Amazon.com has sold during a selected period. The Seattle online retailer is notoriously vague about its product sales, and that’s certainly been the case with its recently-launched Kindle Fire.

Late last month, Amazon issued a press release saying that it sold more than one million Kindles each week during the month of December. However, the release didn’t shed any light on how many Kindle Fires were sold.

Now, financial analyst Anthony DiClemente of Barclays estimates that the online retailer sold 5.5 million last quarter, up from his previous estimates of 4.5 million. He expects Amazon.com to sell 18.4 million this year, also offering some projections on how much money the online retailer could generate through incremental e-commerce sales on the device in 2014. ($3.9 billion).

Peter Kakfka at All Things D first reported on the news.  And despite the sudden success of the Kindle Fire, Kafka notes that he’s yet to see anyone using a Kindle Fire “in the wild.”

Maybe he should hang out in Seattle where a recent report found that 1 out 124 people own a Kindle Fire, by far the highest concentration of any city.

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