What would the stock strings have been on a 1970 Fender Precision?

Fender flatwound. Most likely .45 - .105

Those are medium guage, so I'm pretty sure that'd be considered standard guage. Cause anything under that is considered light. Which, leads me to believe that standards would be the mediums.

 

Fender made them. They still do. But, I added the gauge to my post.

 

Love your avatar by the way

 

If memory serves, they would have been Fender brand strings; probably 45-100 from the factory; and they would have been made by the string company that Fender owned - Squier. Since 2010, Fender's strings have been made - to Fender's specification - by D'Addario. The new 9050 Fender flats do not sound like the old Fender flats. They are very nice flats (and a couple of my basses wear them), but they're in the "modern" sounding family of flats. Not as bright as some - like Chromes, for example - but much more middy sounding than thumpy. About the closest you can come to the originals are the flats that are made by 3 former Squier employees who left to start their own company - GHS Precision Flats. Which is what my '78 P-Bass and it's little brother (Warmoth Mini-P) wear. Just seems... right, somehow...

 

I can’t remember stuff from last week.

 

Stock strings in 1970 were 850 flats, made by V. C. Squier, a company owned by Fender/CBS. I believe the 850s were discontinued when Schultz et. al. bought Fender from CBS in '85. Fender hasn't had anything really like them since. The GHS Precision Flats are very close, but use more symmetrical gauges like 45/65/85/105 while the 850s had different gauges (like a 108? E string).

 

In 1966 the No. 850 set would have had 55/71/90/105 (48/64/80/95 for the light-gauge No. 80 set), but I wouldn't be surprised if it didn't stay that exact way for 19 years:

 

Nah, I never really paid much attention to the gauges 40+ years ago, just knew they weren't symmetrical like most sets these days.