G1 Grimlock question

I recently won a loose, near mint G1 Grimlock from ebay .
But need a clarification 'cause the site reference I used at geocities is all but dead.
Based on wiki, Grimlock's Diaclone incarnation had a Diaclone driver but for obvious reasons, was later ditched in the TF release. My previous K.O Grimlock had an opaque plastic cover located on his back but impossible to open. The Grimlock I won can be opened with ease.
He comes with a rub symbol and is stamped Japan. Is this the 1985 version?
Any input would be most welcomed.......a bit on the OCD side.
But need a clarification 'cause the site reference I used at geocities is all but dead.
Based on wiki, Grimlock's Diaclone incarnation had a Diaclone driver but for obvious reasons, was later ditched in the TF release. My previous K.O Grimlock had an opaque plastic cover located on his back but impossible to open. The Grimlock I won can be opened with ease.
He comes with a rub symbol and is stamped Japan. Is this the 1985 version?
Any input would be most welcomed.......a bit on the OCD side.