There were a good few makers of those 3/4 swing digger in the 1930's era,Austin-Westeren,Byers and Unit to name a few,it's hard to distinguish between them,it would be my guess that the one in your picture is a Unit.
AJ
Thanks guys for the response. I called Roger Martin who has several cats posted in the for sale section and we spoke for about 2 hours about the shovel, his cats and his collection of equiptment. He's a real interesting guy with lots of info. He said the shovel is an Insley built in the late 20's to early 30's.
I would say that you found a late 1920's Insley model C
Where is this old gem parked?
The shovel is located in Southeastern Arizona about 25 miles from the nearest town way up in the hills. Thanks.