There is a Mossberg Collector'sAssociation and at least one book on the history of Mossberg has been written. Either might help you.
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You can contact Vic Havlin of the Mossberg Collector's Association through his website at Havlin Sales. There are a number of fellow Mossberg addicts out there. The 151M was made in 1946-1947, when the model changed to 151M(a), and later, (b) and (c). Production of the 151M(c) ended in 1958.
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