SMG-60 serial HT 14, used shape, leaks. According to David Freeman Ht is the initials of an assembler or employee at Tippmann who had the last name of Trong or Thong. Came with a prototype SMG 60. Aired up to test and it leaked from the valve. Needs a valve rebuilt. Has a trigger stop added, non stock. Serial number could be the 14th but I haven't been able to figure serials out. Definitely a 1987 model but it could be that the DC, DT, U serial prefix came first? I haven't been able to figure it out. I have HT6 and HT7 so I am selling this early model. Body and barrel have rust. Definitely a cool item for a Tippmann collector. See photos and please ask questions if you are unsure of something.