Gents, I bought the aforementioned 16 ga Sauer; supposed to pick it up today at my FFL. I don’t know what grade it is because it is not an export gun, but made for the German market, based on no ‘Made in Prussia’ marking on water table. I have a orig. S, D, & G catalog from 1907, and it matches up to a grade 60, without the gold( thank goodness). Interestingly, the catalog only lists 26” and 28” bbls. available on 16 ga. export models, but this one has 29 5/8” bbls. with concave rib and 6 lb. 1 oz. weight; most definitely not a pigeon gun, but a game gun. Hopefully, I can post some pics later, and maybe someone can tell me exactly what model it may be. Sandlapper