1963 what model,what's it worth, how much did it cost in 63?

Here is a pic of grandpaws watch that was passed down to me. It has  m3 on back which is a 1963 and seriel # is 407785. It is anti magnetic and shock resistant, and self winding. I dont think it has ever been serviced, however the number nine is upside down. I would really like to know how that happened because it doesnt look like it has been moved. It appears perfectly aligned. Would like to know what model,how much it cost new, how much its worth now and if a schematic or repair manual is available for it. Thanks since i cant upload pic here, it is listed under 1963 unknown username popswatch. thanks

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