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Hello Retro and welcome to the forum!
The schematic for your set is a Sams 262-11 published in 1955 so your set is probably a 54 or 55 model.
I don't know much more about it than that other than Sentinel is a bit of an odd brand and not seen too much other than the suitcase sets.
We would love to see it, any chance of a picture or two?
Eric
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