Very close in manufacture date. First Hydro was in 2006, second in 2011. VIP expired, but they were filled by a reputable shop the last time I used them and have been stored with air. Located in Lewes, Delaware. Can ship, but would prefer to meet someone in the Delmarva area to save shipping cost and hassle of emptying them. Asking $175 ea. or $300 for the pair. DIN valves, but I have the yoke inserts for them. They were used previously for NITROX, but I used them for air.