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This Exactra 19 was part of the Exactra series that was manufactured by Texas Instruments though you wouldn’t know it by looking at the front of the calculator. For some reasons, possibly marketing, TI decided to place their only identifying mark on the back cover in small lettering. The Exactra series included the 19, 20, 21, 22and 23 models and was produced starting in 1974. The Exactra 19 is one of the cheaper options in the series and only had 6 digit display.

The Exactra 19 uses 3 AA batteries as opposed to a 9v and has no external power supply as its more expensive brothers the 21 and 22 do. The Exactras aren’t exactly rare and I’ve seen prices all over the place. One sold for $9.99 in good working condition while others have sold for over $100.

Listings from eBay

Texas Instruments Rare Exactra 20 Calculator W/box Works Lightsaber Bubble Nice

$275.00
End Date: Friday Apr-10-2020 13:06:09 PDT
Buy It Now for only: $275.00
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Vintage TEXAS INSTRUMENTS Rare EX-31 EXACTRA 31 Calculator W/ Box

$89.99
End Date: Friday May-1-2020 19:25:20 PDT
Buy It Now for only: $89.99
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Texas Instruments Exactra 21 Calculator with Instructions

$89.99
End Date: Sunday Apr-26-2020 19:44:36 PDT
Buy It Now for only: $89.99
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Vintage Texas Instruments TI Exactra 22 Calculator in Excellent Condition

$49.95
End Date: Thursday Apr-30-2020 12:41:50 PDT
Buy It Now for only: $49.95
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This is the TI Concept II calculator. It was sold by a discount department store called Zayre’s in the mid 70’s and is basically a re-badged TI-1250. In fact, it’s exactly the same except for the colors on the faceplate. It was introduced by Zayre in 1976 and retailed for about $17.00. It has a 8 digit red LED stick display, one memory register and ran on a 9 volt battery. It uses algebraic logic with 6 functions and 24 keys.

The Concept series from Zayre included the Concept 10, Concept 24, Concept I, Concept II, and Concept III. The Concept 24 was made by Lloyd’s while the latter three were made by Texas Instruments. The TI Concept II is not a real popular calculator with collectors but does have some novelty and was made by TI so it does have its place in a collection. The Concept II calculator will sell for $25-$70 depending upon condition and accessories. The Concept III is probably more rare and will sell for over $100.00.