The fact that the dial says "Dishmobile" indicates it was converted to a built-in unit. It looks exactly the same as the one I had, with the exception of the interior color. Question is, why doesn't it say "product of general motors holden's"?

Dandenong is an outer south-east suburb of Melbourne. At the time this was built, Dandenong was the far limit of suburbia.

I wouldn't be sure that GM-H would have bothered with maintaining the name dishmobile for mobile units only. Dishwashers would have been a rare beast in Australia in the early 1960s. The numbers sold would have been tiny. It is quite possible they kept inventory down by having just the dishmobile knob for all dishwashers. My uneducated guess is that they would have been assembled in Dandenong using some locally sourced parts such as motors, solenoid valve and so on, but would have had a large proportion of parts imported from the USA. That is my guess why it doesn't say "Made by General Motors - Holden" because that fascia, trim, knob and so on would have been imported, so it just says "General Motors."

Frigidaire washing machines would have sold in much larger numbers and would have had much more Australian content. They had "made by General Motors - Holden."

Here is a 64 US brochure for the Deluxe "Dishmobile" model. This model was never made as an under-counter unit as the Deluxe model always had the thin control panel. The "U" in your model number of DWDU5 and the brass water valve probably indicates under-counter,  so my assumption it had been a portable is probably incorrect.  Since 1964 was the final year for spin-tubes in the US, perhaps GM sent excessive inventory of control panels to Australia? 

It's a cool dishwasher, nevertheless!!! Congratulations!

Interesting about some folks in the USA putting Holden and Commodore badges on their Chevrolet and Pontiac versions of the Commodore. The opposite is quite common here - more commonly putting Chevrolet badges on a Holden Commodore, or occasionally the Pontiac G8 nose on a Commodore. I have even seen a couple of Holden Commodore Utes (Think El Camino) with the Pontiac front.

I don't think the Pontiac nose was ever officially sold on a Holden here, though it might have been used on a special edition "boy racer" Commodore. They would have a bit of spare inventory of Pontiac snouts after the plug was pulled on Pontiac so suddenly, it would have been a very Australian thing to do to make a "Special Edition" Commodore to use up the left over parts.

Ford did it in the 1970s. The Falcon XB Coupe (the basis of Mad Max's car) sold OK but tastes changed suddenly and the facelifted XC version stopped selling overnight. Ford Australia copied a strategy used in the USA (I think it was on Mustang IIs) and made a Falcon Cobra "Limited Edition" with white paintwork with fat blue stripes down the bonnet (hood), roof and boot (trunk). The Llmited Edition" run was just enough to use up the last of the coupe body shells. No more Falcon Coupes after that. They sold out in no time and are worth a fortune today.

just found the Pontiac nose was indeed used on a Special Commodore Ute. Link below.

Not any more.

GM have shut down Holden altogether. The Holden brand is now dead.

They are still selling off the last few cars.

Their future in Australia is as "GM Special Vehicles" where they will sell a really tiny selection of US GM models. I understand it will start with just Silverado, later Camaro and maybe Corvette, plus a Cadillac of some sort. At least some will be imported Left Hand Drive and be converted by an independent licensed contractor to RHD. Dealers are furious and I understand they are getting a class action together to sue GM. They say GM convinced them to invest millions to upgrade their dealerships only to have their supply of cars stopped at very short notice.

Such a shame. GM made bad decision after bad decision here.

the Opel-based smaller Holdens were popular as they were appealing to look at and lovely to drive, but some proved unreliable and they developed a terrible reputation. Though some owners loved them - my partner had a 1998 Holden Barina SB, the local badged version of the Opel Corsa B, made in Spain, you got a good one or a dud, it was a lottery. We got a great one, had it 280000 km + and it was like new when we traded it in, only replaced to get better safety gear. It was so cute you could kiss it.

Holden replaced them with Daewoo-sourced junk but still badged as Holden Barina. The beginning of the downfall IMHO. All the Korean sourced Holdens were like stepping back 10 years from the Opel sourced cars they replaced and were even less reliable.

I am a big Peugeot / Citroen / Renault fan and I would have liked to see Peugeots wearing Holden badges but I doubt if the rest of Australia agrees with me. People stayed away from the Opel Insignia "Commodore" in droves ("It isn't a proper Commodore, just a European front drive 4 cylinder with Commodore badges, how dumb do Holden think we are?"... etc) so I imagine if they came from Peugeot they would be shunned even more. (Though Peugeot have a long history in Australia, they have always been a niche product.)

Or  turning me into a kangaroo...  ;)