Just to post it here as well, as it has a single ring piston it is a 70E (69cc). If it had a twin ring one, it would have been a 66E (61cc).
This is the only known difference between those models, except the bore of the top end of course, and decales (if present).
There were much fewer 66s than 70s made, so among collectors a confirmed 66E is interesting - but the 70 is of course a more useful saw.
I feel I have to make one further comment on that;
One of the last things the grand ol' Jonsereds guru George Blake (user name "motorsag" on here) posted about was finding a genuine 66E - and he had been looking for one for many years, to complete his collection. To say they aren't really common is an understatement.
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