https://www.galvinhw.com.au/grace2/product.php?pid=4469 I found Galvins in Perth and Adelaide had the best range of pull, very well designed and so easy to use. No jammed fingers. I had 52 something similar to this. I could open with little finger when hand were dirty. Mine were rounder so looked like a full stop on the edge of the cabinet rather than overwhelming the line of the cabinets.

Did you find what you were looking for? Didn't find that exact shape, but here are some options.

with the holes from the original handles you may be lucky enough to find a simple D handle that can be installed in the same position...available in chrome, brushed chrome, white, brass and similar to yours in wood but also available in square and curved shapes...check out all the major hardware stores and also available on line...should start at around $4 each

Just came across your unanswered post... did you find some information on this? I'd suggest talking to the manufacturer/supplier for full details. It would depend if the brass is lacquered or unlacquered. Lacquered may keep the original look longer and does not tend to break down by tap water. (Rain water and dust is another story!) Unlacquered brass will patina over time through exposure to air and handling. You will need a rigourous cleaning routine to maintain the original finish (or just let it do it's beautiful thing!). Exposed to water, it does tend to corrode over time as the component metals break down, usually becomes a pink-ish colour. Hope that helps?