Hey there SSB-
That's a tuff one you’ve asked!
I did some more research on your request (and my curiosity) and this is how it relates:
First and foremost--This is no-way cast in stone and only my opinion from my studies.
If anyone can correct me or add to this—please do so.
IC-41’s (which this appears to be) were built from around Feb. 1947 to around the first quarter of 1954.
They factory upgraded some (not all) with silver-sides with two distinct styles-
The first has a graceful curve starting below the first side window, and going back. The second (later) style had a sharp angular point below the window, before travelling rearward.
If you look close at this one, you can see where (sadly) they painted over the silver siding and it is the (earlier) curved style. This puts it built after May of 47’.
But, this is a tricky call, because through the years, while the factory changed a few subtle outside features to distinguish the later models, many coach companies “upgraded” their early models by installing the silver-sides and changing other pieces themselves to “modernize” their older models. Some even had the silver fluting running completely around the front (non-OEM).
This can be said about the interiors, but I won’t go in to that-
Which brings us to the grille:
There were three distinct grille styles for this model-
The first was a full-width style (like mine), the second was the same, but narrower, and the third was a much smaller squarer one.
This bus has the second type-- but what they decided to do, was remove the grille and the front destination marker above it, and incorporate them into one large grille opening—changing the complete look of the front of this bus. The (former) original grille type puts it later in production.
The front bumper was changed only once through the years—from a split-type with large bumper guards on either side, to a full wrap-around style, later in production. I would think this bus could have had either.
So, this is my take on the year/style on this coach:
I believe it could have been produced anywhere from late 47’ to early 52’.
There were so few of these models produced (1375), and between the factory changes and upgrades, plus the coach companies’ refurbishing and rebuilding-- it’s hard to pin it down exactly.
The Baltimore transit Co. used these, and as they were taken out of service, their shop would just butcher the older ones to rebuild/refurbish the newer ones, until they went to the GMC coach. Many other coach companies followed suit doing this.
But even with all this in mind, I believe the owners of this bus has access to a wrecked or disabled Mack truck tractor.
Most likely, since the Mack dogs and grab handles are from a Mack, I would suspect the front bumper came from the same truck.
No Brills had a front bumper designed like that-
Also, if you look closely at the lower “grille”, you can see it was an early-style, after-market, chrome tail light cover- used to dress-up the back end of a tractor tail light assembly. Very tacky in this application….
So, most likely, all the “custom” additions came from the same truck.
One thing I should point out:
With all my pics and research of this model coach, I’ve seen very few configured in the exact same way.
If fact, I have never seen an exact same design as mine--save the one-off factory custom prototype deck-and-a-half (which mine is not) that has the same size/style side silver fluting and full grille.
This is part of what intrigues me about the ACF Co.—so many variations.
I think they were one of the most “deco-y” buses built in the forties.
As for those “wind-cheating” blocks on the roof:
I can’t speak for Nick, but I liken them akin to the bolts sticking out of Frankenstein’s neck!
I know this was a long read, but I hope it helped some-