It definitely does look like a homebuilt hack using the same case/chassis as that Iskra Delta, although the other possibility is it might have been originally manufactured as an Apple II clone using the same case as that machine, and at some point someone replaced the original floppy drive with an Apple unit. There were *many* companies churning out knockoff Apple IIs back in the day, and not all of them used cases particularly reminiscent of the original. Whatever it is, it's definitely *not* any sort of official Apple prototype. (It could be a prototype of an unsold Iskra Delta Apple clone, I guess.)
If it were in better shape and/or right in front of me I'd consider dropping forty bucks on it just to see if there's anything interesting in it (like an Apple II compatible hard disk controller, maybe?) and because I'm fond of hacked-up oddball computers, but that thing looks like it's been sitting open in that garage for 20 years. Getting it to run again would almost certainly be a very tall order.