This one is the same age as me! Basically the core of a Minicomputer System, this calculator was able to have a load of terminals that could access the core-system and all sorts of peripherals.
There is a lot more information at
http://www.oldcalculatormuseum.com/c-ime86.html
And, a fun old advert for the thing here:
http://www.oldcalculatormuseum.com/a-ime86s.html

This is a rebadged Casio FX-1 which was one of the first (if not the first) LSI IC-based scientific calculators.

There is more information on the Remington at http://www.voidware.com/calcs/rem1259s.htm and on the FX1 at http://www.oldcalculatormuseum.com/casiofx1.html

A lovely old calculator made by Hitachi in Japan with a 14 digit display made up of valve tubes. Cost a small fortune back in 1971. It is mains powered, but it does have a cute little built in carrying handle. More information on this one at:

http://www.oldcalculatormuseum.com/friden1118.html

This is a Second Version Datamath, produced in 1973, although the Datamath range started in the early summer of 1972. This one is boxed with manuals and even some old advertising.

Lots more information on http://www.vintagecalculators.com/html/ti_2500_datamath.html and a page dedicated to this and the machines that followed at http://www.datamath.org/

Datamath box and manuals. I am not sure how the Polystyrene box survived so well for over 30 years but somehow it has.

Original Datamath manual

An original advert for the Datamath.

This model was originally introduced in 1973 - These are both type 3 models released at the end of 1975.
http://www.vintagecalculators.com/html/cambridge_models.html has some more information.

Made in 1974 this cute little machine still uses the half height zero in the display. It only has a 6 digit display but the little arrow allows you to scroll to see the next 6. Lots more about this on http://www.voidware.com/calcs/casiomini.htm and http://www.vintage-technology.info/Pages/calculators/casiopermini607.htm

The VideoSport MK2 was released in 1974 and is one of the earliest European PONG systems. For more information look at http://www.pong-story.com/vsmk2.htm

This one was in really bad condition - The acid in the cables had eaten away at the poly-casing and left marks that made it look like it had been attacked with a soldering iron. This is after a bit of restoration. It works fine.

The box for the Videosport MK2 - I love the graphics on this.

The manual for the Videosport MK2. It's very comforting that it was tested at the factory so we don't need to worry, don't you think?

Made in early 1975 as a "shirt pocket calculator" this one is oddly marked CBM (Commodore Business Machines) rather than Commodore. It only has 7 digits in the display and one of those is a leading minus when it is needed.

There is a page on this at http://www.vintage-technology.info/Pages/calculators/commodgl976m.htm but it's not too easy to get more information on it really... I am guessing by the model numbers of the calculators around it (the 879D came out in 1975) that this is a 1974 or 1975 calculator.

The first of the Micro PDP's and oddly modern looking here. Rather than rewrite the many billion words that have been written on this, the a good place to start is http://www.oldcomputers.arcula.co.uk/up111.htm#pdp-11/03_ and there are even manuals at http://vt100.net/manx/details/1,5027

The main board.

The innards of another LSI11

And another! This one had less dust which is a generally good thing for my lungs. There is an amazing inconsistency in serial numbers on these older machines. Though I think the serial number on this one may be for the BA11-MF cabinet, who knows!

Nobody really knows much about this thing... There is one reference on http://www.vintage-technology.info/pages/calculators/p/prefect8m.htm where he admits to not knowing much either. I am guessing this one at 1975.