Rawson trawlers are rare. Yachtworld, the main listing site for recreational boats has none, Boattrader the number 2 site doesn't even recognize the Rawson name. I did find a listing for one in Oxnard, Ca. See https://www.seacoastyachts.com/listi...oats-for-sale/
It appears to be similar to a lot of Taiwan Tubs (an endearing and derogatory term for trawlers built in Asia during the 70-80s timeframe) such as Marine Traders.
Try doing a search on Yachtworld and Boattrader for trawlers, length, price and year desired and see what you come up with. Should be dozens, maybe a 100 or more in that category.
I have no information at all about who built Rawson trawlers. I assume it was an Asian builder but some quality US built trawlers were built in that period. Willard is one, but will generally be much more $$$.
Good luck and welcome to the trawler fraternity.