S&W hasn't used cast frames since the 19th century.
I don't know about top-breaks, but all hand ejector models have forged frames.
I know the Model 1 "tip-up" .22 calibers were cast, but can't say for any other model. These were not cast "in house" because S&W never had any casting equipment under their roof...at least, until they procured Thompson Center.
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