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[roycv]

Hi Subculture copied across thanks very much.  Most obliged.
Kind regards,
Roy

[DHutch]

Okay this is a scan which should print well, or you can extract the information and put it into a spreadsheet. Just right click and save to your computer.

So that suggests the 6v and 12v marked units are sw item?

[HMS Invisible]

So that suggests the 6v and 12v marked units are sw item?

No, original source data for the spreadsheet was presented in different formats, units and languages so there were bound to be more errors and omissions than reliable figures in those days.

Decaperm 1000 number.
Marxmotor quotes (at the same nominal load torque) 500 rpm per volt for the 12v version and 1000 rpm per volt for the 6 volt version.

Here's what a current wholesale distributor published:
Part No: M68010
6V Marx Decaperm with 2.75:1 gearbox.
Gear Ratio: 2.75:1
Voltage: 6V
No Load Current: 0.6A
Current (at maximum efficiency): 7A
Shaft Diameter: 4mm
Shaft Length: 13mm
source page

Part No: M68020
12V Marx Decaperm with 2.75:1 gearbox.
Gear Ratio: 2.75:1
Voltage: 12V
No Load Current: 0.3A
Current (at maximum efficiency): 3.5A
Shaft Diameter: 4mm
Shaft Length: 13mm
source page
Former distributor Graupner also had two separate stock codes.
The above figures are perfectly consistent with a motor wound in two voltage versions in the Ratio 1:2.

[roycv]

The 12 volt  motor will be marginally more eficient than the 6 volt motor as the losses at the brushes will be less (I squared x R).
I am sure I have had them through my hands with the 6 volt and the 12 volt stickers on as per the above specs.  The same for Hectoperms.
Most of my models are not fast and not large so the Monoperm Super works fine for me and I have a few of them, some with gearboxes and some without.
I have yet to find a use for a solitary Bongo drive, but looking.
Regards
Roy