1979 Nickel On Penny Planchet?

Looks rather convincing to me!

Someone asked for diameter and this is the best way I could give everyone an idea as I do not own no tool to measure ot

Thanks for the pics.

Ok so one more question. Would it be worth it for me to send it off to be graded and how much does that normally run to do so. Is it worth me spending the money to do so and would it increase the value enough to warrant me sending it off. Thank you everyone for all the comments and help with this. You all have been amazing. Thank you

It certainly should be "worth it" in the sense that a slabbed coin clearly labelled as a wrong planchet error would be able to be sold without people questioning its legitimacy. If you put that coin on ebay as-is, with those pictures, many people would probably assume it's some kind of lathed coin and not bid; that doubt would go away if it were slabbed, and the price realised from the extra bidders would be higher.

As for "worth it" in the sense of the coin being worth more in the slab than the cost of getting it slabbed, again, yes; slabbing shouldn't cost you more than $100 including postage both ways, and this seems to be a $200-plus coin. The actual value would also depend on the coin's final grade.

I'm not normally in the "yes you should get it slabbed" crowd, but this coin is certainly an exception for me.