After WWII, the Japanese de-milled their rifles by grinding the mum crest from the receiver. Arisakas with an intact crest are sought after and somewhat rare.
The sporterized one is a type 99 or 7.7. The one with the full stock is a type 38 or 6.5. Grafs used to have stock on the 7.7 fairly regularly. With all the current crazyness. I jave only seen the pricey norma stuff in stock. Of course if you reload ammo for the 7.7 is extremely easy to get.
Now that the gun questions have been answered. 1st picture bottom left is a crutch, a chair wheel, slide ruler? Also the Mrs. is going to get onto you for scuffing up the wall in picture 8 lol.