[mrerick]

With all original parts, in original finish and 95% condition, it would be worth $1400-$1500 to a collector, and more at retail. If the magazine is original and numbered to the gun properly add another 35%-40%. Post some closer detail pictures and we might be able to tell you if it's original finish.

These guns were completely salt blued, and should show something of the surfaces grain and machining in some areas. if the edges are rounded, it is refinished. If they are sharp it might be original.

My first impression is that the frame edges are rounded, and that it has been refinished at some point. If that's true, it is a shooter grade gun, worth $1000 or so. You can also look for any pitting and see if it has been blued over.

As collectors here, we prefer Lugers in their original configuration. That said, your grips are pretty unique.

Your 42 byf Luger was manufactured by Mauser in Oberndorf, Germany in 1942. The serial number includes the suffix letter on the front of the frame under the 4 numeric digits.

Look at sites online like Simpson Ltd. to get an idea of retail / insurance value.

If your gun is all matching, avoid the temptation to fire it. Break a part and the collector and historic value is lost. If you doubt this advice, take a look on this forum for examples of collectable guns damaged this way, and now considered "shooter" grade.

The left grip broke in a place where it's pretty common to break them. Don't replace them if the gun is all matching, and the inside of the grips are properly marked with inspection stamps and possibly the last digits of the serial number. A competent grip restorer like Hugh Clark on this site can repair the damage.