Rare on the Web (2)

This old calculators - probably rare, probably not - are unknow on the Web. Any information you have about similar models, shipping date or factory will be appreciated (please use the mail form).

International. This 12 digits calculator is difficult to date. The old +/= and -/= key arrangement, minus and overflow LED, suggest the built date in the first half of '70. International is a common brand for old transistor radio, but rare on calculators. No model name is present.

Weight/dimensions: 158 gm (8.5 x 13.5 x 2.7 cm)

Circuits: M58623-23P + 5 transistors + 2 LED

Power supply: 4x AA, 6V ext jack 3,5 mm

Santron Electronics, Santronic 300SR. This slide rule calculator sports a wonderful display with dual dimensions LED digits: 10 'big' digits for mantissa and 2 'small' digits for exponent. Santron Electronics sold other calculator, probably built by other  calculator factory. 

Weight/dimensions: 172 gm (8 x 15.2 x 3.4 cm)

Circuits: A4800PC (Rockwell), 14 transistors (chip date-code: second half 1975)

Power supply: 3x AA, ext plug 4.5V (+ centre)

Santronic 80S. This nice calculator use 8 LED digits + sign display, square and % function, auto power-saving feature.

Weight/dimensions: 152 gm (7.5 x 13.5 x 3 cm)

Circuits: TMS0855NC + 11 trans (chip date-code: first half 1975)

Power supply: 4x AA. ext plug

Mayfair Sound Products, model 2W01B. This big calculator looks as the Hitachi Soundesign models. Sports nice front blue glass with 9 fluorescent digit tubes (8 digits plus sign). Two advanced features: display battery-discharge warning indicator (show a rough ! in the sign digit when battery are low) and soft power-on switch, with auto shut-off function. 

Weight/dimensions: 510 gm (11.5 x 19.5 x 4.5 cm)

Circuits: TMS0105NC, 19 transistors (chip date-code: first half 1973)

Power supply: 4x C cell, ext 6V 3.5 mm jack

Silver-Reed SE-8K. This nice calculato with dark plexyglass front and transparent keys

Weight/dimensions: 175 gm (9 x 13.5 x 3 cm)

Circuits: uPD261c, NEC D271D, Toshiba 73096, 12 trans

Power supply: 4x AA, ext 2,5 mm jack (- centre)

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