the altimaster 1 had a 2-3 inch deep case like the altimeters in aircraft. but it had the 0 to 12000 ft face with the orange warning segment at 2500. pretty much the same as the ati 2 is today. i worked for snyder (SSE) from the 60's on thru the ParaPlane corporation days. never saw any alts like the one in the pic
my hat is off to Felix , BUT Capt Kittinger did from an open gondola,NOT a pressurized, climate controlled capsule. in my book that makes Kittinger the better man