Another member here made this comment on another posting:
I'm pretty sure that the P7M13 box You have is from an importer called,"RPB" or something close...Out of Miami...
They imported some P7M8's and P7M13's and they were hard chrome plated,They factory test targets were stamped,"Chrome" also...
Do a search on this forum,You will find it.
The serial number You list for the box,is from a very early P7M13 import.
Now,You just need to find the gun that goes in there.
Something to keep You busy in Your free time!