Fella's;
It's still possible to find a CZ452 Trainer at a reasonable price, though I don't know about N.I.B. The factory is still producing the LH Americans and the RH Scouts, both 452's. Also, it's said that if a distributor, Whittaker's, orders 500 at a time, the factory will build them. Whittaker's has done this several times in the last few years. Those are all RH guns & all American's I think.
The Trainer is an outgrowth of the BRNO series, particularly the number 1, and those were actual military trainers. Whether or not the Czech forces did or do use the 452 Trainer, I don't know. Somebody over at Rimfire Central probably does.
The Trainer and the Ultra Lux both have beechwood stocks, but don't share them. The Ultra has a cheek riser, the Trainer does not. The Lux, not Ultra Lux, is the same gun as the Trainer but with a walnut stock. If you're looking for a Trainer & can't find one, don't turn up your nose at a Lux.
900F