I agree Rex - as 33d6 suggests this will be a local rebrand.
I had a look last evening, but didn't come up with too much. Kershaw, Collins & Co. sold mostly secondhand motorcycles, and their venture as "agents for New Imperial and New Era" was very brief, around May 1936. The date is probably significant: the big firm of Turner Bros., just down the street, "landed" their first shipment of Simplex Villiers motorcycles that month. We know a little about the Simplex
http://classicmotorcycleforum.com/index.php?topic=5942 , almost certainly an import from one of the British firms branded for the Australian market.
An educated guess would be that Kershaw, Collins got bikes from Turner Bros, and rebranded them New Era to sit alongside their New Imperials. Something didn't work out and Kershaw, Collins quickly went back to dealing in secondhand bikes. The building they were renting at 296 Elizabeth St was sold in March 1936, they advertised New Era in May, but moved to 208-210 Latrobe St by August, where there was no further mention of new bikes.
So 33d6 I'm expecting very small numbers, with specs a subset of Turner Bros' Simplex Villiers offerings?
Not very interesting to some, but worth recording. I usually conjure up a dusty bike in a shed with a barely-readable New Era transfer on the tank, or a photo of grandpa on his first post-depression motorcycle, purchased in May 1936...
Leon