Hello Charice, mcdevito75 here, Benrus, a quality watch, selfwinding very good addition, most likely 17 jewel, your great granfathers watch, a very definite collectable, if it's working and keeping good time it most likey has some collector value. If you would like my honest opinion you can ship the watch to me to examine. Contact me at
[email protected] for details. Regards mcdevito75
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