HARMAN SF-260 with orange jacket

Can anyone please tell me when Harman was painting the jackets of their boilers orange (very similar to Tarm)? I have a chance to get what I am assuming to be equivalent to the SF-260. I can only see the pics the guy sent me and he says there is no spec plate on the boiler. It looks exactly like their current models, but definitely orange. I am guessing maybe the first ones they made?

YES, the first ones had orange sheet metal. All of their boilers did including the vf3000. I don't know what year they switched to tan. At least 12 years ago.