I cant get that link to work so forgive me for commenting blind but...
There certainly are some -74s out there with oddly low numbers, more than can be explained by movement swaps alone but in this case I would think it incumbent on the seller to prove this by getting an extract. It should be he making the effort not the buyer, after all it could just be a swapped movement as noted above, not even from a Speedy at all. I wouldn't touch one of these oddball combo watches without an extract personally, why take the risk, its not like the -74 is all that rare or special. He can't have it both ways, either it is a straight -74 with a quirky movement number, or it is a Franken if he is claiming it is a -68. I would think a legit extract as a ~1975 delivered watch would adds its cost and more to the watch value so you have to ask why the seller hasn't gone for one, unless he has something to hide...
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