Pilot P-1 Calculator
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Pilot P-1 Japanese Mechanical Calculator 1961
The Pilot P-1 was a highly portable mechancial calculator made in Japan. While not well known among collectors, the Pilot is one of my all time favorites for its small size and elegant styling.
Here's a blurry video of the Pilot in action:
The shape is similar to that of the Brunsviga Model 10, and I have seen comments that it must be a knockoff imitation. However, this machine uses a pinwheel mechanism (the entry sliders rotate as the machine is cranked) whereas the Model 10 is of the stepped drum variety. Also the Pilot is smaller and lighter than the Brunsviga, and has superior precision. It certainly ranks among the best mechanical calculators for performance per size and weight (with due honors to the Curta and Alpina). Pilot P-1 Mechanical Calculator Japan 1961
The Pilot P-1, introduced in 1961, was made in Japan by the well-known Pilot stationary company, and previously to that, by Keybar Corp (as the model A-1, circa 1957). There also was a later (see below) introduced in 1967. All production ceased in 1969.
These relatively portable computing machines were frequently used in car rally competitions (which is also true of the famous Curta Calculator - System Curt Herzstark) in order to compute drive times mileage and schedules. 
Pilot P-1 Mechanical Calculator - Underside - Japan 1961
Below is the carrying case
And here are some photos of the Pilot P-3
Pilot P-3 Japanese Mechanical Calculator
Pilot Business Machine Co. circa 1967
(Source: Yahoo Auctions)
Pilot P-3 Japanese Mechanical Calculator
Pilot Business Machine Co. circa 1967
Here is a translated Japanese link for the Pilot P-3 model from the Japanese Dentaku museum, where you can use the 'details' link to see more photos and this ad:
Pilot P-3 Japanese Mechanical Calculator
Pilot Business Machine Co. circa 1969
an Odhner-style machine from the 1930s
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