Good article!, a few things to correct: The total run of single overhead cam 750s was almost 800,000 units (from '69 thru '78), not 445,000. The sandcast is somewhat rare, (not due to the percentage PRODUCED from the factory), but rather how many survived. Back in '69 when first introduced the bike (due to an inferior drive chain), the sandcasts were launching chains through the cases on a daily basis..thus leading to Honda having to replace those cases with new (now no value) diecast cases. I personally know of one Dealer in L.A. that was stacking destroyed sandcast cases weekly, 4 ft. high along a 40 ft. shop wall, all headed for the scrap yard. Multiply that times all the U.S. Honda Dealers at the time (yes, we know, Los Angeles sold the most bikes back then). Another contributor to the low survival rate of the sandcast, was that back in '69, many people were chopping their bikes (permanently destroying the frame), OR street drag racing, and crashing, sending the bike to the scrap yard as well. So, it is Not 45% of sandcasts that remain, it's more like 5% (worldwide). Also, the 1,078th bike, as mentioned (IF it were diecast from the factory, and if All bikes were merely using diecast cases from the beginning) would actually have more value than later bikes (primarily because Honda was making important running changes back then to that early model), such as the ultra rare sandcast oil filter cover (stopped from the factory at frame # 1,860), or the "no pointer", no "OFF ON OFF" kill switch (only seen on the first few hundred bikes). In fact, thru the 1970 model, there were some Three Hundred changes made to the bike, making those early parts rare of course, obviously raising that hypothetical diecast bike's value on its own. Thanks! Vic ... View more