I'd like to update a couple of my responses, as I've learned a bit more about this car over the past 2 1/2 years:
released from 1911 to 1914?
I don't know the exact year, but I believe it was built during that time or a bit earlier.
I'm now almost 100% certain the car was built during that time.
Is this a one-off project?
Yes
The car began as a one-off project. However, the builder soon managed to make his creation the subject of some publicity, and so the decision was made to go ahead with production. (Was this his plan all along?) A company and brand name were established, and I assume investors were enlisted, but I don't know if any cars were ever produced beyond the original featured in this puzzle.