The 141 was made from 1936 to 1950.
You will not find a "book" value on a D or F grade. They are worth whatever someone will pay for them. Condition is EVERYTHING! Like new you might buy a new truck for what you could get. If a junker you might have a hard time giving it away.
Have it properly appraised by a KNOWLEDGEABLE appraiser not some local yocal gunsmith before you even think about letting it go.
GB