I don't think the "870 Wingmaster" specific model was ever offered in a
3 1/2" chamber - although there were many versions of the 870 that were made in 3 1/2", I'm not confident they ever carried the "Wingmaster" name.
The Wingmaster, even today, is available in a 12ga 2 3/4" or 3" chamber - as well as 20, 28ga and .410 ( and I know in the past they offered some 16ga as well ) - and they offer it in "Trap" versions, etc.
But I'm not an expert on the Wingmaster model either.
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