There are/were two types of Ia-marked grips. Neither have any added filler material (rayon, cotton, cellulose) that was added to the composition material. I think this was because of the worsening situation in Nazi Germany and the facilities that made these 3 items available for military usage. Sauer did not make their own grips. They were contracted out to another company. Your grips (327318) probably have a more pronounced hollowed-out effect on the inside and are easier to break than the first type Ia marked grips. All of the grips used on the Model 38/38H pistols are made of Bakelite. Phenol is one of the main components of Bakelite and it has a tendency to leech out of the material over long periods of time....thus making the Sauer grips even more suspect to breakage. Without seeing the grips on the pistol you are interested in, I'd say they are correct. JIM