I'm by no means a vintage buff, but I'm looking forward to finally diving with my "new" 109, which until this month had been stuck in a basement for over 30 years. I'd been kicking around the idea of getting it serviced and using it for the last few years (basically since I started thinking about buying my own gear) but was waiting for a good excuse to do it and a specific use for the reg in mind. The stars aligned earlier this month as I started contemplating putting together a sidemount rig (and needing a second reg set to do it) and my boss needing to find 4 MK5s and 8 109/156's for a project he was working on. Lent to him in pieces in a bag with a moldy diaphragm and returned serviced and upgraded... now I just have to figure out what 1st stage to put it on.