Turn and Bank Indicator, 4 Minute Turn, 2.5 inch, PN A1050 Hudson It appears that the lens

It appears that the lens can be removed and the upper and lower operating limit indicators can be set by sliding the triangular pointers along the scale (we have not attempted this in order to preserve the artifact)

maximum 2000 ft/minute

it details the use of flight instruments of the era

It is in nice condition given its age

Type A-8 stopwatches were used in any WWII aircraft with a navigator

Turn and Bank Indicator, 4 Minute Turn, 2.5 inch, PN A1050 Hudson It appears that the lensThis is a recent era 2. 5 inch, 4 Minute turn, Turn and Bank Indicator made by RC Allen. The glass and case are intact, as is the glass inclinometer. Measures ~5 inches long.