Vintage or antique mechanical speed indicator or tachometer  no. 440 in original box with some spare parts.

The makers name on the box is Millers Falls, on the speed indicator itself is Goodel-Pratt.

Millers Falls took over Goodel-Pratt in 1931, so this instrument is probably from the early 1930's.

It is in a good used condition, working unknown

The size of the box is around 12.5 x 5.5 x 2 cm.

Take a good look at the photos!