This is my Blast being resurrected from original (Nanao 2930) monitor failure.
Yes that is a 29/27" 24khz (Hitachi tube/Wells Gardner P719 neck board + K7500 chassis) monitor.
I sourced it locally (thank you Boston Craig's) from a broken Golden Tee (reference below) price 50$.
I removed everything (tube/neck board+chassis) and "back mounted" it (thanks 300wins) inside the Sega frame.
The original cab wiring was then altered/spliced for the new/different (r/g/b/ground/h+v/AC) connectors.
Purists will be cursing my name +2, while inside I grew tired of... and permanently removed the PCB door kill switch.
I'm trying to show the small gap between the bezel and the cab with my finger catching on the edge.
It is very minor, but unsolvable dew to the curve of the tube being (Hitachi vs. Toshiba) different.