So: It is all metal, sightglass for lubricant, carrying/using handle is at an angle to the motor housing, 7-1/4" almost for sure. Definetely will not accomodate an 8" blade. On the base is a "77" which tells me it is a model 77 of some type. Not especially lightweight so probably not magnesium.
Some of the models I looked at online have a red handle and this one does not.
I would ask Skil, but their answer is no doubt that with no nameplate, they can't help.
Thanks for any assistance. Bob AZ