1958 HD-5G into the fold:

Widow is downsizing on retained possessions. I've known the tractor which is complete for a lot of years. However, it's not been ran in about six years. Engine is not frozen and I don't know about the steering clutches, but u/c appears to be in fair condition. It also has the bolt on grouser segments on top of the street pads. Story is the tractor was used to dig the basement to the house addition, and then put into the barn. There it remained not coming out till a couple of weeks ago to convert the parking space to a horse stall.

Last of the HD5 machines was 1955 , 
If you find the Serial # on dash plate or on the rear casting it can confirm the year built 
Lot of small changes over years of production , improvements to loader frame are some along with the 2 speed reverse transmission . 
 With the loader pads without single grouser I dug many basements, put in drives, loaded many trucks and leveled many yards . Bought mine in 1972 and still have it , a 1955 HD5G - had 3 others 5G machines I sold and 1 HD5B from 1948 to 1955 machines