Victor Yann made Fly fishing reel circa 1930s-1940s.
History
The Yann 'heavy duty' ventilated drum fly reel was purpose-built by engineer Mr.Victor Yann of Heilderberg Victoria around the 1940s-1950s, who also produced the Streamcraft and Atlas Fly reels for the Australian domestic market. Yann referred to this specific fly reel depicted below as the “Tasmanian.” The reel’s special design feature is the solid Aluminium alloy body and ventilated drum, which was machined from Aluminium alloy bar stock, and modeled on the classic fly reel design.
The origin of Yann “Tasmanian” has been identified by well acclaimed Fly tier and author, Mick Hall, of Ballarat Victoria. Mick received the “Tasmanian” Fly reel as a gift from the late Bill Auston back in 2001, when Bill visited Mick at his home in Eildon Victoria. The said gift was significant because Bill Auston had the pleasure of meeting Victor Yann back in the 1940s, when Yann stayed over in his lodge near the banks of the Goulburn River, to fish a well-known Dome Hole below the wall of Lake Eildon. Mick Hall has kindly provided images of the Yann “Tasmanian” Fly reel and his account about who made the 'Tasmanian', in a personal letter (see below) sent to me on the 5th of March 2021, in which he describes and verifies, who made the Yann “Tasmanian” Fly reel, and what was its purpose (i.e. designed to fish Trout up to 10Lbs).  
It’s pertinent to comment that is not known if the Yann “Tasmanian”, was a prototype made with the intention of future production; whether it was made by Yann for personal use, or whether it was made on order from Yann’s engineering company. Ladd. B. 6/3/2001.

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“ Hi Bernie,
Back in 2001, the late Bill Austin called into our home at Eildon bearing a gift, an old fly reel that was given to him by Victor Yann Back in the 1940s. During that period Bill Auston and family were running a lodge almost on the banks of the Goulburn River, and very close to the famous Dome Hole below the wall of Lake Eildon. The Lake at that time held a huge population of small Galaxiids and at times schools of them would be sucked over the tiered wall and into the Dome hole below, stunning themselves as they fell, only to be picked up by the waiting trout below. These trout were big, 6lb were common with the occasional 10-pounder in the mix. Anglers, mostly fly fishers, would wade out onto a gravel bar and cast Smelt imitations into the fast-flowing stream in the hope of catching and landing one of these brutes. Those anglers needed strong gear, large reels with plenty of line. Many of these anglers were notable fly fishers of the day, and most stayed at Bill's lodge. So did Victor Yann who in turn gave this reel to Bill Auston. Bill told me that Victor Yann called it the Tasmanian, tough and rugged to handle those big fish and at the same time hold a lot of line.  Mick Hall "