Nice Luis, Very Nice!!
If my grandson likes his 'straight' as much as your son likes his, I'll have to get him a small brush for his birthday along with the usual stack of $1.00 bills!! (He thinks he's a Millionaire)!
Here's his razor next to a 6/8 Genco that was recently given to me :tu This what it looked like before I reworked it.
I bought it for $5 delivered from China. It was advertised as 'a straight razor knife'. I figured for that amount of money including shipping I could afford to see what happened.
Attachment 147708
It should fit nicely in his 5 year old hand! :shrug: