My speculation would be that it's most likely later than yours.
Two features point that way:
1. The braces on the handles, which are absent on your machine, but present [though a bit different] on the current models.
2. The bolt holes along the front of the engine mounting - which to me indicate that it once had a front guard, not unlike the fixed one seen on the very late machines.
As far as the belt tensioner goes, there's not enough detail in those pics to tell if it might once have had one.
Yours does look like it did.
Cheers,
Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
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