Early black Russian made V7D big muff "tall box". I modded this one for true bypass and a boss style 9V jack for better quality of life. It's also been recapped, with the power filtering cap being changed from a 22uF to a 100uF like you'd see on USA Muffs which is more appropriate for use with external power supplies. No battery clip inside. No mods done to the audio signal path, no circuit traces cut.