The attached link will go to pictures of one of my Finnish Lugers with this type of grips. The link will go to a post on another board ( I hope that this is ok ! )This one came to me along with a few other Finnish lugers two years ago. Century Arms received a lot of 20 Lugers from Finland and this one was included in the group. I also was fortunate enough to have added 4 to my collection from this import that have the round brass unit disk still intact in the right grip panel. In addition to the luger pictured in the link above I think that I have two or three other Finn Lugers with the same replacement grip. The others have all come to me from the four winds. I have also seen pictures of a few other Finn Lugers with this type of grip.
http://www.gunboards.com/luger/topic.asp?TOPIC_ID=1341