help wanted regarding a Stanley steam car engine

My father died in the 60s and always told us this was a Stanley Steamer engine. It has been sitting in garages for decades and is covered in dust. I did not want to use any chemicals on it to clean it as I those it might decrease its value.
​Can anybody help me to identity the engine please. 
​i would also like to sell the engine once i know what year and type it is.
 
Thanks. Tom
please let steam car network know your thoughts by using the comments box below.

 Michael Zerega It's early, dry engine, right hand drive

Mark Herman There should be a serial number stamped on the frame that will help identify the engine more accurately. It should be on the forged crossmember in the middle of the engine. Additionally the number of teeth on the gear will tell us what style of car it came from. Looks like a great artifact!
 
Daryl Kendall Appears to be an EX. Engine. 1908.
 
Steam Car Network I have been told it has 49 teeth.
 
Daryl Kendall It either a 1908 EX or a 1909 E2 engine . Probably miss counted the teeth , probably a 48 tooth. 3" bore x 4"stroke. Has numbers on the frame cross-member probably starts with a 6- 000
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Daryl Kendall 1908 EX. Or a 1909 E2 engine. 48 tooth
 
Mark Herman Recheck the teeth, I think an EX has 49 teeth
 
Daryl Kendall 48 teeth on EX and E2

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