Well, what a blast of nostalgia from Elizabeth St, Melbourne, heart of the motorcycle district for many years.
R's first photo shows Cottman and Co at 291-293, the building in which Turner Bros were located in the 1930s. In mid 1940, Turner Bros moved next door to no 295, so this dates the photo to sometime after 1940.
Cottman and Co should be known worldwide for the famous Cottman Colt, their entry in the list of "Australian made" motorcycles. The 1930s Cottman Colt was probably a rebadged Royal Enfield two stroke, but exact details of business arrangements and the extent of knocked-down-ness of these "Australian" bikes of the 1930s is not well understood. Thus my original question about the Simplex Villiers.
Interestingly, I've changed my mind about the origin of some "Australian" bikes from the earlier period - say 1900 - 1925. We used to call lots of machines "rebadged", but I've been gathering evidence to show that lots of early bikes, while they might look just like their British or European cousins, were in fact made here from sets of parts. As a example, there are quite a number of machines in the veteran period that have been described in the past as "rebadged Arnos", but I now see that these were assembled in Australia using kits of Arno Parts. There is a restored veteran "Western Star" in the UK that may raise eyebrows: it looks just like a veteran Arno, but with Western Star painted on the tank. Most likely it was built in Australia, albeit using an engine and kit of lugs supplied by Arno.
Similarly, we had Australian-made Clement Garrards (Clement engine and Garrard (Norton) cycle parts, brought in as a kit from the UK), Australian made Thor clones (think Camel back Indian), Australian made NSUs, Australian made Moto Reves (to the pattern of the UK-made Moto Reve), Australian made Sun Villiers, etc. etc. Interesting, but not very exciting.
So the Cottman Colt may have been a "rebadged Royal Enfield", or it may have been built up from parts. From the sound of the Turner Bros adverts arrived in one piece, branded Simplex, from the UK, but there are other possibilities...
The Finlay Bros building in Elizabeth St was still there when I lived in Melbourne in the 70s and 80s, but I suppose it's gone now.
Cheers
Leon