Trinar is a triplet, AFAIK, and these were very common on "budget models" of more costly cameras both before and after the War. If you look at catalog pages from those times, you'll often see the same camera listed with two or three choices of shutter, two or three (or more) lens choices, and occasionally other features (like automatic frame counting).
Zeiss selling camera with Rodenstock lenses might well be as
@JPD suggested; due to shortages post-War, or because Zeiss hadn't gotten their lens production up to volume and were concentrating on the more profitable lenses (Tessars, specifically) and buying from other suppliers to cover the lower end of the market. I've got a Super Ikonta B that I've dated to 1948 that has an uncoated Tessar, likely indicating using up pre-War parts production (it's a pre-War model, as well, despite post-War production numbers). Still works well, though...