My '79 sportster Ironhead was one of 5,199 built 1-9-79 thru2-7-79. 44,707 were manufactured,But..from jan.9 thru feb.7 the vin# was not on the engine block.an engine block# was stamped on the block,deciphering the code was a long drawn out process,there's still a discrepency,I can't figure out what the center three digits refer too? Any help? the bike is customized w/fat tank and plenty chrome/sweet paint/drag pipes/forward controls and s&s carb. I'm a few over 200lbs,and this scoot screams... Check out my pics... Curious to know how many still exist out there?