As I recall Marlin made a numberr of top break revolvers in .32 and .38 S&W calibers, most of these bore no markings at all, or were marked with the distributor's markings. And most were nickle plated. Most of these had black hard rubber grips but some were pearl gripped.
A friend of mine had one that popped open with each shot. We took the gun to the service station and had the frame lugs built up with a brazing rod, then filed down to work properly. Also made a pair of oversized target grips of walnut.
That gun really was an eye-catcher. He loaned that revolver to the secretery where he worked. She killed herself with that gun after being jilted in a three-way affair with the owner of the company. Never saw that gun again.
Bob Wright