Vintage Green Eyed Black Cat Pen & Letter Note Holder Mail Inkwell Japan

This is an adorable little cat designed to hold mail or notes. There is a hole in the back for a pen or pencil. It looks as though the little bowl might be for holding ink. It does show signs of age and wear. The spring is rusty. The paint is flaking. I don't see any major flaws like cracks or chips. The spring is removable. Inside it looks like it's marked "ALCO." Thanks for looking!