Welcome to the Forum...
Let the fun begin!!!
Congrats on a SUPER Speedway. There is SO much to learn when it comes to Illinois watches,
and just when you think you have discovered it all... BANG, you discover something new.
The first thing you should do is get Fred Friedberg's book on Illinois.
It is available and it has incredible information inside.
This forum has the greatest concentration of Illinois collectors anywhere,
so you are bound to have some fun here and learn a thing or 2.
My first question is... do you have a good watchmaker who knows this brand?
There are folks here who can recommend a good person.
The Speedway you have has an interesting dial that I have seen on very few examples.
Not sure if it is original or not, but it could be a Hamilton owned era replacement dial.
Don't get rid of it or have it redialed. It is cool for now.
There are several "Speedway" models with the Model 178 designation.
Some examples were given to drivers of the INDY 500 "Speedway"
(photo indy motor speedway)
The pattern like yours with the floral pattern is more common and the "Checkerboard"
seen a bit less. IMO.
This is the most common dial.
Here is an original Speedway in the box:
(Exploding porcelain dial)
Keep that band OFF of it!!!
It is NOT original and will only harm the lugs by having metal rubbing against those beautiful engraved lugs.
Crystals are available on ebay.
A good watchmaker will have a very small hand at the 6 position "Seconds"
Again, welcome to the forum and enjoy the Illinois Journey.