Mason #1 Steam Car Engine

Greg Owen
Email
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Mason #1 Steam Car Engine, photos, help?
Here sending some photos of a Mason #1 engine that I "restored" a few years back. It was partially disassembled, but had virtually every last original bolt and screw, missing only the main crankshaft drive sprocket. It had suffered a major cylinder head cap failure at some point, and two of the valve eccentric rods were slightly bent.
I had every intention of restoring it to working condition, at least enough to get it going on compressed air, but as things progressed it became obvious that I could not meet that goal. So, instead I fitted it with 1/4 inch plexiglass plates on the valve chest and one cylinder (cutaway effect, I suppose). Gave it a snappy colour scheme, and was pretty happy with the results, as a nice display.
Early on, I was able to identify it as a brass-frame 2 1/2 by 3 1/2 bore Mason # 1, as every detail matched the 1902 Mason catalogue. But my efforts to find more information about its exact age, and what car it might have come from, have been frustrating (sound familiar?). Most of what I have read comes from a variety of forum postings, some of which are inconsistent, etc.
Recently I came across the posts here from Billings Cooke about his Grout restoration, and was interested to see that his engine appears to match mine in every detail (aside from the Grout-marked valve chest cover), and is thus also a Mason #1. I am however aware that Mason supplied engines to a number of makers, and have heard that they would assign serial numbers according to whatever the buyers wanted.
My engine bears serial # 1008. Does anyone have any information about when this engine might have been made, and/or what car it might have come from? Also, how many makers used Mason #1 engines? As far as I know there was Stanley, Locomobile, Mobile, and apparently Grout. Surely there must have been more, but maybe those details are now long-lost to history.
Amy comments appreciated, this is a wonderful site for all manner of steam car information. I could post some more photos of my little engine if anyone is interested.... Thanks! - Greg