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The Sentinel used the same drive sprocket as the M3 Medium tank (Grant/Lee).
This was designed to drive the track via the extensions of the track pins unlike most other sprockets which engaged slots in the track elements. The sprockets on the Grant/Lee/Sentinel are a unique shape and very distinctive. I've dug out some images and 1;25 parts scan from a hard copy Grant model I have in my stash.
A website article said the cast numbers for the hull were usually ground off so that the spare track links would sit flush against the hull - explains why the numbers were ground off in the Littlefield/Cairns example.
Regards,
Charlie
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