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Calculators: Handheld: Sperry Remington 663 (type I)

Size (approx): 80mm x 154mm x 40mm (max)  (w,h,d)
Weight 234g excluding batteries.
Power: 6.0V DC, 4 x AA size batteries.  Also accepts adapter (model AD-4145 500mW) through a top side socket on the left. 
Case: Very solid square-shaped calculator made from smooth black plastic.  Brushed aluminium panel covers half of the front.  Display is tilted about 20 degrees with a neutral filter.  Logo and model is printed on aluminium panel and has survived well.  Keys are long travel, soft action and work very well.  There is a metal tag on the left hand side (about 1cm down) for a carry strap.  Battery compartment has red pull-out silk ribbon.  On/off switch is located  on the left side about 3/4 of the way up.  
Display: 6 digit blue VFD display - no seventh digit
Features: Basic four function with display shift
Age: c1973
Manufacturer: Sperry Remington, a trademark of the Sperry Rand Corporation.  Made in Japan.  Serial No. (on battery cover) 2217675 and 1052568 on the inside of the compartment..
Comments: Lovely early calculator with really shaky logic and operation.  I probably would have thrown this calculator out of the window if I had bought it even though it feels like a dream!  Lower segment zero display is typical quirky early Sperry.  Case is dark brown leatherette with a full top and right side length zip. There is an embossed Sperry Remington logo on the front.  These calculators are very similar to the early horizontal Casio machines like the Casio Mini CM602.

Components: 1 x cpu: NEC µPD177C K3Y486, 28 pin DIL, 0.6" width
1 x IC NEC µPD129C K3Y466, 16 pin DIL, 0.3" width
6 x VFD tubes: NEC LD8035E
5 x transistors
5 x diodes
17 x capacitors
14 x resistors
2 x resistor arrays
1 x sealed transformer block
Boards: The main cpu board (6M-1A) sits loose and has the display and keyboard assembly mounted on it.  Underneath is a secondary large board (6M-2A) which is joined by ten stiff wires.  A piece of stiff sticky card separates the two boards.
Construction: Remove the screw from the top edge.  Then carefully prize apart one side (from the top) with a blunt soft instrument (I use wooden coffee stirrer sticks) to pop the lugs.  Carefully hinge of the front of the case from the bottom edge.  Quite difficult so if in doubt - don't risk damaging your calculator.

Logic comments: The Clear key (C) will cancel last entry on the first press and clear the calculator on the second
Overflow on the input of a number is suppressed
There is no constant function
The negative sign is shown on the immediate left but disappears past the sixth digit!
Negative numbers are really dodgy - the "-" sign disappears when it feels like it!
A divide by zero is flagged by "000000" an overflow error by "o" and is not recoverable
The left arrow key is used to see  the six least significant digits
It suffers the pseudo fixed decimal bug: key in (1)(+)(0)(.)(0)(0)(=) and you will get "1.00" which reverts to normal at the next calculation.
It suffers from the negative zero bug: key in (1)(-)(2)(=) to give "-1" then (+)(1)(=) will give "-0"
Try pressing (C) and, say (-) at the same time - it will show all zeros and points

This scan on the left shows the calculator with the front cover removed, exposing the main cpu board.  A secondary board sits underneath with the majority of components on it.

Notice the early individual tube VFD units and mass of wires they generate.

I'm not too impressed by the board design as it needs two large brown jumper wires to make the necessary connections.

Sperry display

This is a close-up of the number "123045" in Sperry "small zero" notation.  

It has been suggested to me that this system was used as it was more capable of withstanding the failure of a particular display segment - and you could still tell what the number was.